My SAAB 900 has been running on 10w40 for the entire 35,000 miles I've done in it. 2 weeks ago I switched it out for 5w40 fully synth because it was being sold off for £16 for 5 litres.
There's no doubt its smoother on startup now. just anecdotal but it does seem that a lower cold viscosity has a benefit or two. Once warmed up feels no difference.
It may be relevant that before I put this oil I retorqued the head bolts and changed the rocker cover gasket, which after 21 years use was laughably permeable.
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'98 Saab 9-3 2.3i Conv owner. Former keeper of 1996 Saab 900iS 2.0 conv, 2001 V40 2.0i, 1999 Mondeo TD, 1995 Mondeo TD, 1990 Passat GT16v, 1983 Passat 1.8CL
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