I have a 93 honda civic with a swapped JDM D15B vtec engine. This engine is similar to D16Z6 in many aspects. Honda service manual suggests to use 5W30 Or 10W30 with API ratings of SG or SH for 92 -95 civic while 5W30 or 10W30 API SJ for 96-00 civic.
Currently we don’t find any 5W30 or 10W30 API SG, SH or SJ in the market. Minumum available is 10w30 with SM API rating or otherwise one have to choose 20W50 if he really wants to stick with SG, SH OR SJ ratings, now that’s a very thick oil for a vtec engine, I believe.
What best oil to choose for engines of this vintage, temperature variations in my area are 32 to 110°F almost.
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