Quote:
Originally Posted by 222s
I personally would only use a good 15/50 or 20/50 on an engine of this age. A thinner grade oil (of equivalent quality) will also mean lower oil pressure & thinner film strength on the bearing surfaces. Check the API rating of any oil that you're looking at buying - many 20/50s marketed for old cars aren't great....
Castrol GTX 15/50 and Halfords regular oil range 15/50s are decent (if you can still find them) & were my preferred choice, but the rating for the Halfords classic 20/50 isn't anything to write home about. I use it sometimes only because it's easily available rather than out of choice....
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I use Mobil 1 15W 50 in my B18 - it's fully sythetic and the biz.
Just stay away from bloody Castrol Magnatec - it's essentially very expensive mineral oil and is in fact a bit minging......