As noted previous -- Mobil 1 10W40 HM!!!!
Esters act a seal swellers. High Mileage oils or Redline are possible alternatives. Of course seal replacement is the obvious choice but that's $$$.Yes, manual states 10W40 but that was 10W40 in 1992. The main goal is to reduce leaking/seeping of oil. So I am trying to go thicker. I have considered 50W oils but, on the other end, this engine does rev high and generate a high oil pressure so I don't know if I want to get crazy with the high temp thickness. Plus, I have heard really thick oils drive up oil temperature due to the reduced flow.
In the thread posted above, someone said ester based oils are bad for these engines. First I have heard of that.
Get M1. CHeap, always accessible.You guys have made me dig deeper and I think I am leaning toward a 15W50 now. I am looking at M1, Motul 2100 and Redline.
Make it Redline.You guys have made me dig deeper and I think I am leaning toward a 15W50 now. I am looking at M1, Motul 2100 and Redline.
And I have added Royal Purple HPS 20W50 and Amsoil ZRF 20W50 as these are close to 15W50. The RP, in particular, is quite thin.You guys have made me dig deeper and I think I am leaning toward a 15W50 now. I am looking at M1, Motul 2100 and Redline.