Re: Synthetic Blend
why not just try to use a full can of semi-synthetic oil instead of mixing 50/50 of blen and dino oil? Try a full can of synth-blend and see if it leaks, if it does not, then stick with the synth blend. The synthetic blend is halfway between the mineral oil and the fully synthetic oil and IMO it should be OK and does not cost so much.
I was using the mineral oil for sometime and later changed to the semi-synthetic oil and do not see any leak whatsoever on the engine. The viscosity of the oil i use is 10W-40 and is of the Castrol brand. Good oil for the money at US$17 a gallon.
However, I'll soon try out the cheaper bulk mineral 5W-30 oil (US$2 a Quart) from ACE Hardware with a mix of Tufoil Engine oil additive to see if the combination works for me to try save cost. ACE recently opened an outlet here in Malaysia and they carry lots of things, but that's something I'm sure you already know....
Suzuki Samurai (a.k.a. Jimny SJ413 in Asia)
K&N, Shackles, 235s, 1" Wheel Spacers, Driving, Spot & Reversing Lamps, KYB Shocks, Bosch +4s, RX-7 Mk.5 seats
Kuala Lumpur, Malaysia