For most people, I think the compact is a slightly better choice even if the first car they install these on has a horizontal drain. The reason is if a future or additional car has a vertical drain, you would have to buy a second drainer for the compact valve OR use a standard valve (to match your standard drainer) and risk ground clearance problems.
Yes, you have to have the drainer for it to make sense to use them. But its the same for the key with locking lug nuts.
Like I said, defeats the purpose.
Two piece drains are better because: (1) more ground clearance (2) won't lose oil if the valve fails/leaks, (3) won't dent your thumb when operating, (4) can't be accidentally opened by freak debris impacts, (5) can order thread lengths that match your oil pan thickness allowing more complete oil draining.
Two piece valves are good.
I'm talking about the thread LENGTH. With the washer, a 9mm length thread will be flush with the inside of the pan. Anything shorter (not likley) and its not as sturdy, anything longer (likely if they don't offer different length 12mm x 1.75) and some oil won't drain (imagine a bathtub with the drain sticking up over the bottom instead of being flush or recessed). Of course even with a drain plug, there could be some standing oil left if the hole isn't the lowest point (not sure about the GT without looking again).
No need to read anything. Yes that part can be used in your car. 12mm x 1.75 is the thread specs for your oil pan. But like a 12mm bolt, it could be any length 1/2 inch long, 10 inches long, ?. We'd like to know how LONG the threads are so we know how far into the pan the threads extend because oil will only drain until it reaches the top end of the threads. You don't need to go back and read anything, but it would be nice if you could measure how LONG the threads are when you get the part and post it.
Thanks.
