Quote:
Originally Posted by HarryD
Bill:
Looking at my Bentley, 20W-50 is recommended for 15 F to 100F+
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"API SE or SF 10w/50, 15w/40, or 20w50 For all year operation Latter oil not for temperature below -15C"
SF became the spec in 1988 ZDDP for that and SE was ~1100/1400
generally these were non synthetic back in that era. Porsche latter codified it and specified
mineral oil
15w-40, 20w-50 for temps mostly above 50F/10C
synthetic oil
10w-40, 15w-40, 15w-50 for temps mostly above 50F/10C
other specs for lower temps of course,
This is all in the TSBs from the era