Im new to the zddp oil. I know its good for older engines with flat tap cams and lifters.

I recently bought a 1976 f100, 302 flat tap engine with 60,000 miles on it.
I will be using it as a daily driver and work truck.
I was thinking of 10-40 oil, and I live Texas.
What will be a good oil with zddp?

Ive read on this site that Shell Rotella 15W40 is good.
So what do y'all think?

Thank you

 

either the rotella 15w-40 or the chevron both have high zddp and will suit your engine well.
I'm using rotella currently but if I find chevron on sale for cheaper I'll use it.

 

I went to the store the other day looking for Shell Rotella 15W40.
I found a 4 gallon jug for 13.77, now it stated it was for diesel use.

Am I looking at the right oil and is it safe for my engine?
My engine has been sitting for a few years.
Should I use a reconditioning additive in the oil and if so what type?
What would be a good high flow oil filter to use?

Thank you

 

Sounds like the engine is broken in well. Break in is where the high ZDDP really shines. I have been running a plain ole 10w-30 synthetic in my 74' 302 for years now. Never any issues an doil pressure is still extremely good.

It is common for guys to run a diesel oil like the Chevron Delo or Shell Rotella in the older engines.

 

What chevron oil are you referring to?
Is it Chevron Delo 400 XLE synblend 10W30 or a diffrent type?
Thank you

 

the chevron delo 400 15w-40

 

What I do is I add a pint of STP oil treatment to whatever oil I choose, usually whatever is on sale. 10-30 or 10-40 is a good weight. Straight 30 is also a good choice.

The STP is a viscosity improver and has ZDDP in it.

 

Really, no matter what oil you choose the ZDDP level is all about the same...low..........
After the engine is broken in, where ZDDP benefits is at start-up..........

When an engine is fired up, that is when the most damage occurs as you know......ZDDP is the additive that all oils have used for decades to (paraphrasing here) coat the cam/crank bearings since they operate on oil pressure, which is essence lifts and separates the cam/crank journals away from the bearings. ZDDP in essence, acts as a minature roller bearing to prevent/minimize this wear.

The reduction of ZDDP in all of the oils (including diesel) is such that flat tappet cam lobes by appearance, are the first to suffer excessive wear as a result of the lower ZDDP levels.

To reduce cat converter contamination, the ZDDP in the oils was reduced from around 2000 ppm to about 700 ppm (within the last 18 months if you include diesels), which the engineers advise this is plenty for any engine......but this reduction has paralleled with the increase of flat tappt cam failures, valve tick, etc.

The one thing that the aftermarket cam mfgs & machinists agree upon is engines need about 1400 ppm of ZDDP, the newer engines (modulars) with cats, about 1000 ppm. While the oil companies disagree, they recently added another additive to the oils as a "wear reducer" (the name escapes me now).

I add one bottle of ZDDP per after discussing this in detail with Ron Eskenderian (yes, Isky Racing Cams), and I add 1/3 of a bottle to my mod motors as well (1997 Cougar Sport 4.6 & 2006 Lincoln Mark LT 5.4)- IIRR it is a 9 oz bottle.