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Old 07-29-2003, 11:01 AM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
Posts: 2,055
If you look at the API certification on the Delo package you will see that it meets both the current diesel spec, which is CI-4 and the current spark ignition spec, which is SL.

CI-4 oils have a higher concentration of detergent, dispersant, anti-wear, and anti-corrosion additives, which diesels require. These are also good for SI engines, but the only potential problem is that the combustion byproducts of these additive are not kind to catalyitic converters, which is one reason why SL oils have less additive concentration.

I use CI-4 oil in my vintage SI engine cars that don't have catalytic converters, but continue to use SL oil in my modern cars that have catalytic converters.

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