John,
See your M3W is going to Malaysia. I lived in HK for 30 years and raced in the Asian circuits for good part of that. Raced in KL and in Johore where we garaged the cars for six months out of the year, before doing the circuit of NZ, Thailand, Macau and China.
I ran my 58 +4 there and used Valvoline VR-1 either 40 weight(for heat as you mention) or 20-50 when available. One or the other was readily available and since high in ZDDP for flat tappet engine it was great. BUT assume your M3W will have a catalytic converter so not too good with the ZDDP--or so I am led to believe. I now use VR-1 20-50 here in Arizona for my 58 and 86 + 4's as temps can reach 120 F in August.
In my M3W I use Mobil 1 20-50 V Twin Motorcycle oil and believe this is widely available in Malaysia(the bike boys used it at Shah Alam). In Arizona the Harley guys swear by Mobil 1-use it and change it often is their motto.
I have a business in Vietnam and my son lives in Sing. so am often in Malaysia as well. Good luck with the three wheeler.
Tom
