ACEA ratings A1 vs. A5????

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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?
 
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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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quote:
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
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.
 
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