Oil for 4.6L stroker

[SilverXJ]

You probably know this already, but if you don't lead and O2 sensors don't get along too well.

[lafrad]

100LL AVGas will let a new set of narrowband O2 sensors live for 10K - 25K miles... *IF* he is maintaining a closed loop oxygen sensor ECU for the baja race... then you should be able to just replace the sensors each race and be fine.

[AMDninjaboy]

I only have a wideband o2.. I figured I would have to replace it each year but thats no problem..

[PolloLoco]

Amsoil does have some other high Zinc oils: http://jeep.blackonyx.net/forum/Amsoil_ ... Tappet.pdf

Brad Penn has a semi-synthetic high zinc oil and Joe Gibbs makes a good dino oil with high zinc. And as I said before the Valvoline Racing oil is good (not the VR1).

Amsoil has revised this bulletin and has added more oils with high levels of zinc:
http://www.amsoil.com/techservicesbulle ... tappet.pdf

My next oil change will use Z-ROD 10W30 but for the OP there is a list of racing oils that you should use.

[dwg86]

Valvoline vr1 has .13 zinc and .12 phospherus (see item number 6).
http://www.valvoline.com/faqs/motor-oil/racing-oil/