TheLion70x77
Well-Known Member
I posted this over in another thread, but it's a good summary of what we know for sure at this point:
I like to summarize things as the information is a bit scattered, here is a summary of what we know regarding the differences in oil viscosity specifications across the various Coyote based Mustangs:
S197 Chassis (1st Gen 5.0)
2011-2014 Mustang GT - 5W-20 for US and no oil cooler
2011-2014 Mustang GT Track Pack - 5W-50 with water to oil cooler, ECU calibration has neutered over temperature safeties to my knowledge unlike the regular GT's for this generation.
2013-2014 Mustang Boss 302 - 5W-50 with water to oil cooler and a special variant of the 5.0 code named Road Runner (higher strength powder forged rods, re-balanced crank, higher valve lift, stiffer valve springs, CNC ported heads, oil squirters deleted, high flow intake manifold, rev limit at 7,400 rpm). ECU calibration has neutered over temperature safeties.
S550 Chassis (2nd Gen 5.0)
2015-2017 Mustang GT - 5W-20 for US with 1" radiator and water to oil cooler, Australian version 5W-20 original spec, switched to 5W-30 spec, UK version spec 5W-20 like US. ECU has over temperature safeties.
2015-2017 Mustang GT Performance Package - 5W-20 for US with 1.5" radiator and water to oil cooler, Australian version 5W-20 original spec, switched to 5W-30 spec, UK version spec 5W-20 like US. ECU has over temperature safeties.
2015-2017 Shelby GT350 - 5W-50 with water to oil cooler for US only, Voodoo 5.2L FPC engine. ECU has over temperature safeties.
2015-2017 Shelby GT350R + Track Pack - 5W-50 with air to oil cooler and differential cooler for US only, Voodoo 5.2L FPC engine. ECU has over temperature safeties.
S550 Chassis (3rd Gen 5.0)
2018-2019 Mustang GT - 5W-20 for Street and 5W-30 for Track as per user manual, 1" radiator and water to oil cooler, Australian and UK version same oil specifications. ECU has over temperature safeties.
2018-2019 Mustang GT Performance Package Level 1 and 2 - 5W-20 for Street and 5W-30 for Track as per user manual, 1.5" radiator and water to oil cooler, Australian and UK version same oil specifications. ECU has over temperature safeties.
2018-2019 Shelby GT350/R - 5W-50 with air to oil cooler and differential cooler for US only, Voodoo 5.2L FPC engine. Track Pack cooling is now standard on all variants due to the significant customer complaints with the earlier ones over heating (non-track pack). ECU has over temperature safeties.
Ford Racing School 2015 Mustang GT Performance Package cars are upgraded with a custom Air to Oil cooler, larger radiator, full racing seats, 4 point harness and roll cage, Ford Performance Track Handling Pack but run a bone stock 5.0L V8 on the factory ECU calibration for 2015 models. They run Castrol Edge Supercar 5W-50 and a FL-500S filter. I e-mailed them and those are the specs they provided including pictures of their air to oil cooler.
Things we know about the ECU tuning: Cam phasor control tables for the Voodoo 5.2L appear to be identical to those in the regular Coyote 5.0L. Voodoo 5.2L calls for 5W-50 all the time while the 5.0L ranges from 5W-20, 5W-30 and 5W-50 in it's various iterations throughout the last eight years (2011 up to 2019) and including different oil viscosity specifications for Australian 2015-2017 Mustang GT's than their US and UK counterparts. Also on OP from the UK said his Ford UK dealer refused to honor warranty with anything less than 5W-30. While that was just a single dealer, he seemed to indicate it was one of the larger Ford dealers in the UK.
Ford Shop Manual Rod Bearing-to-Crank Clearance Range: 0.0011 to 0.0027 inches. The nominal (average) clearance of the extreme spread int he spec is 0.0019 inches. I believe to the best of my knowledge the bearing shells are supplied by Clevite (a sub-company of Mahle).
Ford Coyote 5.0L Rod Journal Dia. size is 2.082 inches according to Ford Racing's Basic Engine Dimensions spec sheet. Clevite recommends 0.0007" clearance added for ever 1" of bearing size and +0.0005 clearance on top for performance engine builds. So (0.0007 * 2.082) + 0.0005 = 0.00196" Rod Bearing-to-Crank Journal clearance.
Gee, this is exactly what the nominal clearance on the both the Coyote 5.0L production engine is and ALSO on the Ford Performance Aluminator Voodoo 5.2L with Manly forged rods and Mahle forged pistons as per their data sheet that is rated at 580 HP - 445 ft-lbs torque with an 8,250 RPM rev limit. Am I missing anything? Maybe at last we can put to rest the debate about weather a production 5.0 can safely run higher viscosity oils and why the differences generation to generation.
Also note just for reference, the 5th Gen LT1 based Camaro SS (6th gen Alpha Chassis) calls for 5W-30 for normal operations and 0W-40 or 5W-40 for track use. While it can run on 87, the user manual advises to run 91 octane and that pinging may occur on lower octanes. The Hemi 392 (6.4L) calls for 0W-40 all the time and requires a minimum of 91 octane.
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