oil recomedations......confused

Either straight weight Shell Rotella-T (30w or 40w) or Valvoline Racing VR1 (I prefer the 20w50).

After reading thread and asking around my preference would be Mobil 1 Synthetic + ZDDP. The Valvoline Racing VR1 would be my second option. I know Rotella is a good option but there is a chance that it can foam at sustained high RPM's. I know, the chances this might happen are rare, but IMO is a small chance I don't want to deal with.

If your going to use mobil 1 in your flat tappet engine consider using the extended performance version, because it is intended for longer oil change intervals it has the highest level of ZDDP.

IMO, you guys are complicating things too much. Just buy the full synthetic, $22 a gallon at Walmart, and add the ZDDP. Then you would know you have enough. The extended stuff gets $$$ for what you get.

This Anthony is adding ZDDP with the blue bottle STP stuff. Then I'm going to switch to motorcycle oil. Motorcycles, for the most part, don't have catylitic converters, or roller lifters. (there's bound to be a Honda or BMW that does...but the bike place I frequent sells Harleys, and I get a great discount on parts and stuff.)
The oil is still manufactured to the API SF or SG service grade, which contains plenty of Zinc and Phosphorus.
The service manager for the Harley shop, speaking in general mind you, recommended I use the thinnest oil that will give adequate oil pressure and performance. Thinner oil is easier to pump, and induces less pumping loss in the motor. It also cools the pistons etc much better than thicker stuff. The engine may use a little of the thin stuff, but then you know your piston rings are getting adequately lubed.

Yes, I know a water cooled PCM V8 is not an air-cooled V-twin, but the concepts should still apply.

JoeinNY wrote: As for the STP or other additives, if you couldn't get it any other way its probably better than nothing but whether its as effective a delivery system is hard to tell and hotly debated.

Thus my reasoning for switching over to M/C oil...Ok, that and I get it cheaply too.

Oh...Love the holeshot video, man.

on a similar note and I never believed this stuff until my brother in law told me. He runs the maintenance shop for the border patrol in San Diego. They take the trucks out in the canyons and whatnot and more often than you might think punch a hold in the pan. They'd just drive it back to the shop and burn the motor up. The prolong guy came by the shop and tried to sell them some but they were as skeptical as I was. He talked them into taking an old truck and putting prolong in it and then draining the oil. They drove the truck around with no oil for a hour. The valves were making quite a bit of noise because the lifters weren't pumped up but the engine was still running. He bought a 55 gallon drum and when the trucks come back in RUNNING they just pop a new pan on and send the truck back out. True story.

TRBenj wrote: Either straight weight Shell Rotella-T (30w or 40w) or Valvoline Racing VR1 (I prefer the 20w50).

Tim , is it just me or some do not get the big picture as to the oils to run in these old motors. You and I did a lot of research on the subject and I still read of owners doing the NASTY to their engines.
They want to add this or add that or but WalMart oil and add whatever to "build" their own master blend.
As for the motorcycle oil that is where it belongs, I guess the next post we will see....
I have a cam and lifter failure , who sells a good cam and lifter combo??????????
Just asking a question as to people and their reasoning behind products they use................Boat dr

Ok nc2001 the way I see it is this?Do you have a stock engine,or is it modified?If its stock then use what the owners manuel tells you.If not then use a synthetic.Just my two cents worth.I'm sure I will here commets on this.

Mark too many dollars and time invested in that stroker to play games with oils.
Rotella 40T . Lottsa ZDDP . About the only thing left on the market that I will use, Valvoline specs say they have it , but I am kinda Gun Shy of Vavoline products.
Just my .02 worth.....Boat dr

mobil 1 extended performance version, with gold cap full syn..is the best i'll never use any thing else. I also like there (mobil 1's)filter/but napa's is good to. somthing to remember if your switching for the first time to full syn.. oil you will hve a leak or two and once you go Syn never go back. As for the leaks I found mobil 1 extended performance version stopped the leaking in my 83 SN 351. I used to use mobil 1 full syn..with the green cap. and I had a few leaks but one other thing to keep in mind is your location I am in norther Cal with miled winters so its not in issue for th 15 portion ogf the 15/50 waite. If you did no know the 15 part of the oil tell you that the oil will turn to jelly at approximatly 15'F so if your in a cold area that gets below 15' cange tho oil befor using the boat if it was subjected to such cold weather.

I used to be a fan of Castrol in the 80's... but times and technology change... The manual on my '89 PCM calls for 10W30 weight. you really wont go outside the heat range of it unless you have an overheating issue. If you give amsoil a call they specs for PCM engines in their catalog. It runs great & clean, pretty easy to find as well. Just read about some of the longevity of people who use it on their website.

TYPICAL TECHNICAL PROPERTIES

AMSOIL FORMULA 4-STROKE� MARINE SYNTHETIC MOTOR OIL (WCT)
SAE 10W-30, API SL, NMMA FC-W

Kinematic Viscosity @ 100�C, cSt (ASTM D-445)
11.7
Kinematic Viscosity @ 40�C, cSt (ASTM D-445)
74.5
Viscosity Index (ASTM D-2270)
152
CCS Viscosity, cP @ (�C) (ASTM D-5293)
6032 (-25)
Flash Point �C (�F) (ASTM D 92)
236 (457)
Fire Point �C (�F) (ASTM D 92) 258 (496)
Pour Point �C (�F) (ASTM D 97) -48 (-54)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)
4.8%
Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150�C, 1800 rpm, 1 hour, Scar in mm)
0.40
Total Base Number (ASTM D-2896) 10.5
HTHS (cP) 3.64
Humidity Cabinet Rust (ASTM D-1748) Pass

chemistry class wasnt as bad

Brktracer wrote: Where was data found to support that STP contains ZDDP? According to the MSDS for STP it contains 1-5% proprietary zinc compounds. Are the compounds ZDDP?

It specifically says ZDDP on the label on the bottle I bought. I'd post a picture, but I'm at work.