10w 30 full synthetic

[2015 Silver GT]

I ran Amsoil 10W-30 in my 2011 GT based on my oil analysis reports and the same reports shared in Troy's (Unleashed Beast) thread on SVT Performance. In that thread Troy found Amsoil 5W-20 to hold up just as well as the 10W-30 and started recommending that weight. My first oil change I did on the 2015 I used Amsoil 5W-20 and haven't decided yet if I will deviate from that weight.

Remember in the 2011-2014 cars all the 5.0's had the same engines. Track Pack and non Track Pack cars. All non Track Pack cars called for 5W-20 and Track Pack cars called for 5W-50. The 5W-50 was based on intended usage although most didn't actually track their cars. My point? Sticking to the recommended 5W-20 isn't necessary. It comes down to how the car is going to be used and ones climate as well.

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[Knight5.0]

I ran Amsoil 10W-30 in my 2011 GT based on my oil analysis reports and the same reports shared in Troy's (Unleashed Beast) thread on SVT Performance. In that thread Troy found Amsoil 5W-20 to hold up just as well as the 10W-30 and started recommending that weight. My first oil change I did on the 2015 I used Amsoil 5W-20 and haven't decided yet if I will deviate from that weight.

Remember in the 2011-2014 cars all the 5.0's had the same engines. Track Pack and non Track Pack cars. All non Track Pack cars called for 5W-20 and Track Pack cars called for 5W-50. The 5W-50 was based on intended usage although most didn't actually track their cars. My point? Sticking to the recommended 5W-20 isn't necessary. It comes down to how the car is going to be used and ones climate as well.

If I was to deviate (and I do) from the recomended 5w-20 I would go 5w-30 or 0w-30 for a daily driver and 5w-40 or 0w-40 if I was driving the car really hard.

Remember 80% of your engine wear occurs at start up and getting the oil moving faster is going to reduce that wear. The manufactuers know this and that is why they no longer recomend 10w-xx oils any more.

The low hot rating (xx-20) is provides adequate protection but is geared toward improving economy. My Ecoboost recommends 5w-30, I run 0w-30 in the winter and 0w-40 in the summer.

Thank you for the info. I think on SVT fourm was were I read all the oil threads and decided to change over. I'm thinking 5w 40 now. I don't daily my car, and I don't take off like I'm in a race from every stoplight/stop sign, but sometimes I drive it hard. I have been running pensoil ultra platinum "derived from natural gas " since it came out. Was running Mobil 1 before that.


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[madweazl]

Highly scientific data on the subject can be found here. There all kinds of side effects when changing viscosity apparently...

 

[mustang_guy]

I ran Amsoil 10W-30 in my 2011 GT based on my oil analysis reports and the same reports shared in Troy's (Unleashed Beast) thread on SVT Performance. In that thread Troy found Amsoil 5W-20 to hold up just[ as well as the 10W-30 and started recommending that weight. My first oil change I did on the 2015 I used Amsoil 5W-20 and haven't decided yet if I will deviate from that weight.

Remember in the 2011-2014 cars all the 5.0's had the same engines. Track Pack and non Track Pack cars. All non Track Pack cars called for 5W-20 and Track Pack cars called for 5W-50. The 5W-50 was based on intended usage although most didn't actually track their cars. My point? Sticking to the recommended 5W-20 isn't necessary. It comes down to how the car is going to be used and ones climate as well.

Oh yeah. I keep forgetting about this since you mentioned that to me a few months ago. So used to the previous way. Wasnt it 5w20 was only acceptable with amsoil at that weight?

 

[2015 Silver GT]

Highly scientific data on the subject can be found here. There all kinds of side effects when changing viscosity apparently...

I had no side effects and the same thing with many many others running 10W-30. Again Ford called for 5W-20 and 5W-50 in the same car with the same motor. Just different intended usage.

Oh yeah. I keep forgetting about this since you mentioned that to me a few months ago. So used to the previous way. Wasnt it 5w20 was only acceptable with amsoil at that weight?

Well in the case of that thread Troy is very pro Amsoil as am I. So take that with a grain of salt. All of the the testing by guys was with mostly Amsoil.

 

[ero 5.0]

I run royal purple 10w30 at the suggestion of many people on this forum. 5w-20 is prolly fine if you drive it like a grandma...

 

[dgc333]

Highly scientific data on the subject can be found here. There all kinds of side effects when changing viscosity apparently...

I hope you are kidding, nothing scientific there. That is a Prius forum with a bunch of folks discussing oil just like this thread.

 

[D3adch1ld]

I had a chat with my buddy at Royal Purple, he suggested to stick with the suggested weight, if after very hard runs I see my oil pressure lower than usual, step up to 5w30. If the car is tracked all the time and I mean road racing, not drag, he still suggested to go incrementally higher 5w40, 5w50 till the oil pressure was maintained. Here's the kicker, with the oil cooler and lower thermostat temps my 5w30 is feeling too heavy even beating the crap out the car. Ah, also, I'm running HPS, full synthetic but with massive additives, used to run in on my built 4g63 (10w30) and it never thinned out like Mobil1 15w50.

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[madweazl]

I had a chat with my buddy at Royal Purple, he suggested to stick with the suggested weight, if after very hard runs I see my oil pressure lower than usual, step up to 5w30. If the car is tracked all the time and I mean road racing, not drag, he still suggested to go incrementally higher 5w40, 5w50 till the oil pressure was maintained. Here's the kicker, with the oil cooler and lower thermostat temps my 5w30 is feeling too heavy even beating the crap out the car. Ah, also, I'm running HPS, full synthetic but with massive additives, used to run in on my built 4g63 (10w30) and it never thinned out like Mobil1 15w50.

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Since the oil is thinning at higher temps, wouldnt the pressure increase?

 

[D3adch1ld]

Since the oil is thinning at higher temps, wouldnt the pressure increase?

The thinner the oil, the easier it travels, the less pressure. The higher the viscosity the higher the friction, the higher the pressure. In a PP GT look at the oil pressure at start up with cold oild, see where it starts at before becoming normal.

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[madweazl]

The thinner the oil, the easier it travels, the less pressure. The higher the viscosity the higher the friction, the higher the pressure. In a PP GT look at the oil pressure at start up with cold oild, see where it starts at before becoming normal.

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Since we're running 5w20, that means absolutely nothing (lower viscosity at lower temps). As for the rest of it, I have no idea.

 

[dgc333]

Since we're running 5w20, that means absolutely nothing (lower viscosity at lower temps). As for the rest of it, I have no idea.

????????
All motor oils are thicker at lower temps than at higher temperatures. Regardless of the oils viscosity you will have higher pressure at start up than at operating temps

 

[jasonstang]

????????
All motor oils are thicker at lower temps than at higher temperatures. Regardless of the oils viscosity you will have higher pressure at start up than at operating temps

0W is gonna flow better than 5W at low temperature. However 0W30 will wear out faster than a 5W30 and becoming thinner at operation temperature.
Personally I would go for a 5W30 over 0W30 if you drive in hot climate.

 

[madweazl]

????????
All motor oils are thicker at lower temps than at higher temperatures. Regardless of the oils viscosity you will have higher pressure at start up than at operating temps

When cold, 5w20 acts like SAE 5 oil. As it heats up (typically rated at 100° Celsius), it acts like SAE 20 oil.

 

[Ajax]

If you want scientific data read Bobistheoilguy's dissertation on oil.

After reading it you will find that 5w30 does not provide a substantial increase in protection at 220 -230 degrees than 5w20. Both perform similar below 200 degrees. But 10w 30 is a lot worse from a viscosity perspective than 5w30 at less than 100 degrees.


I can confirm from personal experience on my 2015 gt pp that 10w 30 has higher oil pressure at cold startup than 5w20 or 5w30 in the summer and I live in Tampa Florida. Once fully warmed up they both are equal. Don't just focus on the end temp, focus on the startup temp as well.

I run 5w30 personally but if 0w30 was readily available I would probably use it.

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