Engine oil recommendations are now based on making sure that the engine is as economic as possible AND does not fail within the main warranty period too often.
Design spec for most petrol engines is 0 or 5w30 (No effective difference unless you live at the Poles) and is 0 or 5w40 for a diesel.
Some new hybrid petrol engines are OK on 0 or 5w20 oils.
Those design specs are for engines in good condition that do not suffer from fuel contamination.
I think using an 0w30 in a high mileage diesel is OK in winter but a silly idea in summer.
0 or 5w40 is the way to go!
If you suffer from fuel contamination of the oil, cut the oil change interval in half or use an oil additive like Ceratec.
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2003 V40 1.9TD Mods: Scratches, bent bumpers, raised REAR mats & internal mud guards.
SHELL ULTRA 5/40 & LIQUI MOLY CERATEC.
Everyone should DYOR (Do Your Own Research)
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