ACEA ratings A1 vs. A5????

[Dr. T]

Guys, what's the difference between A1 and A5??? The A1 is HT/HS of 2.6-3.5 and the A5 is 2.9-3.5. Why bother differentiating?? Wouldn't an oil that's listed eg. Syntec 5-30 as A1 automatically qualify under A5 if it's HT/HS is 3.0?

 

[TooSlick]

Dr T, The ACEA A1/B1 oils are the lowest quality level available in Europe - they roughly correspond to the API, "SJ/CF" specification. The ACEA, A5/B5 oils are low viscosity versions of the ACEA, A3/B4 catagory and have the same test limits for wear/deposits/oil consumption, etc .... Engines designed to use the ACEA A5/B5 oils normally have a roller type valvetrain design, to reduce the loads between the cam lobes and valve lifters. The thicker ACEA A3/B4 oils are better for direct acting cams, where the lobes push directly down on the tops of the lifter body. Ted

 

[G-MAN]

quote:

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Originally posted by TooSlick: Dr T, The ACEA A1/B1 oils are the lowest quality level available in Europe - they roughly correspond to the API, "SJ/CF" specification. The ACEA, A5/B5 oils are low viscosity versions of the ACEA, A3/B4 catagory and have the same test limits for wear/deposits/oil consumption, etc .... Engines designed to use the ACEA A5/B5 oils normally have a roller type valvetrain design, to reduce the loads between the cam lobes and valve lifters. The thicker ACEA A3/B4 oils are better for direct acting cams, where the lobes push directly down on the tops of the lifter body. Ted

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Ted, you're confusing A2 for A1. The latest A1 spec is A1-02. A2 is the old spec and was last updated in 96. Most premium conventional oils sold in Europe are rated A1, with A3 and A5 being the premium synthetic oils.

 

[Ken2]

Dr. T Look at pages 4, 5, & 6 of this publication http://www.acea.be/ACEA/20020618PublicationsOilSequences.pdf Ken