Engine oils..

miniyazz

miniyazz

miniyazz

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How important is the 'C' category in ACEA classification of oils? I'm just looking for oil for the Jag and the manual advises API SJ/EC and ACEA A1 or A3 (5W30). No mention of ACEA C1/2/3 etc. But reading about oils suggests C designations offer better oil for cars with 3-way catalytic converters.. which is surely every petrol car for the last 15+ years?

So, seek out oils also meeting C1/2/3 classifications in addition to what is recommended in the manual (at twice the price), or just go with what the manual says?:confused:
 
Isn't the C rating for diesel engines and A for petrol?

My bad. - It's B for diesel and C is common for low sulphur fuels (which I misunderstood to mean "EURO" spec diesels).

Reading between the lines, a C3 oil is probably also A3?
 
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It looks like C has extra requirements over and above A. C is for DPFs as well as 3 way cats so I guess newer diesels will generally require C.

On the API spec, C is for diesels and S is for petrols :)
 
http://sas-origin.onstreammedia.com/origin/lubrizol/EOACEA2009/RPTOOL2010Dep/rp/pc/index.html
is a great tool for creating comparitive peformance charts.
VAG 507.00 is the most demanding in vitually category and opie oils do a £23/5l Gulf one.

Screenshot%202014-06-01%2017.31.46.jpg
 
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