what oil for m42???

[bmw///m3///]

Hello I have a m42 and have been using 20-50 regular oil for my 36k mile engine. Sometimes the valves tick a little. What oil do you other recommend.
It seems the synthetic to be a option but its lilte over $5 a quart and does it work that much better? My mech said to just through in some STP to keep the valves from ticking???
Thanks

[gooten1]

I'm running synthetic, and had the same in the old ti (M42). Seemed to run a bit smoother than fossil oil. (But I don't remember the grade, sorry.)

[windnsea00]

In SD down here i use Chevron Supreme 20w50...supposedly one of the best dino oils out there...Castrol GTX is well rated also...I know Castrol has a synthetic also with 20w50 rating...but changing to synthetic later in the life of the engine can sometimes cause drinking issues etc.

[bmw///m3///]

i just used the basic exxon fossil 20w-50 and sometimes my valves tick, does these happen to your guys cars too???
Thanks

[bmw///m3///]

Originally Posted by windnsea00

In SD down here i use Chevron Supreme 20w50...supposedly one of the best dino oils out there...Castrol GTX is well rated also...I know Castrol has a synthetic also with 20w50 rating...but changing to synthetic later in the life of the engine can sometimes cause drinking issues etc.

what drinking issues, my engine only has 35k miles?