[Mach1Mona]

Just wondering what is the Best Motor oil to use in my 1969 rebuilt 351W? The engine is mostly stock bored .30 over

What would you guys/gals figure is best??

 

[2Manystangs]

Modern oils have so much additive that they are all basically "good", the main thing is just to keep it changed regularly...for me my 96 cobra always gets full synthetic Mobil 1, with over 150K miles it still runs like new...I had a 289 run clean as a whistle with Castrol 10-30 for years...I'm sure you'll get a gazillion opinions on this but these are mine.

 

[Joel85stangcoup]

If you are running a newly rebuilt flat tappet motor then I would suggest an oil with zinc and phosphorus such as royal purple break in oil or valvoline vr1 racing oil (conventional not synthetic). Here is a link to the valvoline oil, Valvoline.com > Products > Racing > Racing Motor Oil Racing > VR1 Racing Oil (VR1)

 

[1969 LE600]

I second the VR1 I run it in my 69 with a 351c.

 

[rpxr400]

If you're going to run synthetic, don't do it until your engine breaks in for a thousand or more miles - otherwise the parts won't seat properly.

 

[cindys_sn95]

the valvoline VR1 is really good.

 

[1978CobraII]

If you don't want to ruin the cam over time get a good zinc additive. Break the engine in on conventional with the additive then switch to what ever you want while still using the additive.

 

[andrewmp6]

What type of lifters do you have ?

 

[Mach1Mona]

I dont kniw what type of lifters are in the car as it was rebuilt when i bought it. I think i should be well past the break in period by know as i drove it accross atlantic canada when i bought it, plue it was rebuilt back in 2002.

the big question i guess now is convential or synthetic??? is it worth the extra bucks to go to synthetic. Is there any reason why i should use synthetic in an old engine??

 

[andrewmp6]

Like that has been said if its a flat tappet cam and lifters you need zinc or you can wear a cam lobe smooth.If it was me id pull the intake and see what lifters i have then pick which oil to run.The epa made most oil companies pull the zinc out because it will kill the cats on newer cars but older cars need it.

 

[cindys_sn95]

the VR1 has plenty of ZDDP in it, that is why it is so good for older cars!

 

[1978CobraII]

Typical Flat Tappets need 2500ppm of zinc during break in and 1500ppm for every day use. Check Cam Shield cam-shield premium ZDDP antiwear protection for camshafts, lifters and valve trains in your classic car or hot rod, for more info I bought some of their products.

 

[sixtsixstang]

Synthetic Mobile 1.