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in numerous vintage cars*** I use Mobil 1 0w-40 in cold weather and above 40 F I use Mobil 1 15w-50. Plenty of zinc / phosphorus in both of them for flat tappet engines. Never had any oiling issues. Z *** I've used those oils for 15-20 years in Jaguar e types, XK-120 & 150's, MGA's, Austin...

Originally Posted By: kschachn Originally Posted By: TheKracken Mobile 1 TDT 5w40 Good for gas engines too, more ZDDP than the mobile 1 0w40 I have a ton of this stuff and plan to use it with 0w20 AFE mobile to reduce the amount of ZDDP for less risk of cats going bad. Where do you buy...

Originally Posted By: KingCake Replace the freaking valve cover gasket. It's cheaper and faster than changing the oil. ^^^^^^. This. ( Sometimes there are threads where the OP has nothing to say, but goes ahead and says it anyway. ) Z

Originally Posted By: TFB1 Originally Posted By: zray Before 1966 their was a difference in the PCV systems for the CA market and. The rest of the USA. Late '66 and later all the Fords used the closed PCV system. Aftermarket vendors do not have this correct. Z Is that so??? How come 45 years...

Before 1966 their was a difference in the PCV systems for the CA market and. The rest of the USA. Late '66 and later all the Fords used the closed PCV system. Aftermarket vendors do not have this correct. Z

We're all LOL, in my case at how easy it is get a rise out of the experts here. Don't you know when you're being had ? Z

Originally Posted By: TFB1 I fully agree with Shannow's diagrams and I'm a old Ford guy as well... Own a '69 428 Cobra Jet Torino(at least one since '73) & '72 302 Comet, with PCV configured to '67 models(IE open breather cap) Not to nitpick, although that is the common form of warfare here...

Really now, none of those illustrations have a passing resemblance to an actual PCV valve cone taper, which provides a much different operation that your simplistic explanation is capable of conveying. Z

Originally Posted By: Brad_C Originally Posted By: zray However, under the full load condition, flow is minimal because the crankcase pressure does not move a significant volume thru the pcv system in comparison to the flow generated by a vacuum. What a load of horse hockey. The "volume...

Originally Posted By: Shannow Originally Posted By: zray Once again, real world experience is trumped by internet bull sh*t. Actually your diagram proves my point . It shows At full load, the PCV is flowing very little, which is the point I've asserted from the beginning. At high rpm, which is...

It closes, but not 100%, when the vacuum is very low, or very high. So at high load, or at idle, at PCV is flowing much less than it does at cruising load & moderate rpm. If you take one apart you can see the cone shape that rises up, and that seals off more flow as the vacuum rises above a set...

L Originally Posted By: Shannow Originally Posted By: zray They will pass more oil when the flow thru the PCV is the greatest, ie at highest vacuum. While there is flow thru the PCV when engine vacuum is low or at zero, it is substantially less than during the high vacuum periods of engine...

I think the correct engineering of the baffle arrangement in the valve cover has more to do with how much oil gets thru the PCV valve and into the catch can or intake manifold, than how much high rpm driving is done. Some cars never pass oil into the intake manifold and do quite nicely without a...

Originally Posted By: Clevy Originally Posted By: zray Originally Posted By: Shannow Originally Posted By: zray There won't be much oil or anything else being sucked out of the crankcase during the situation described by the OP. WHY ? Because the PCV system depends on engine vacuum to do...

Originally Posted By: Shannow If the crankcase pressure is causing gaskets weeps, then there's a whole bunch of flow going into the inlet manifold...period. The flow of oil into the intake manifold, if any, has nothing to do with the valve cover gaskets leaking. The valve cover gasket and main...

Originally Posted By: 440Magnum Originally Posted By: zray . Proof: check out those leaking valve cover gaskets and crankcase seals after a hard run around the track or highway. That's were the excess crankcase pressure is going, not much in comparison is making it thru the PCV. The very same...

Originally Posted By: Shannow Originally Posted By: zray There won't be much oil or anything else being sucked out of the crankcase during the situation described by the OP. WHY ? Because the PCV system depends on engine vacuum to do sucking. And there isn't much engine vacuum at any rpm when...

Originally Posted By: 440Magnum I wouldn't change anything unless you see increased consumption back in your regular driving routine. Chances are the extended high-RPM operation sent a lot of oil through the PCV system, there's no reason to assume that it went past the rings or valve seals. Such...

Been using Mobil 1 15w-50 in numerous vintage autos for over 16 years and many tens of thousands of miles. Never had a single cam / lifter failure. It has plenty of zddp (1300/1200 ppm ) for flat tappet engines. Here is short list of cars I have used it in: Shelby Cobra (original) 289's and...

Originally Posted By: NattyBoh So long story short, my wife has been religious about her oil changes. The car has always been with her and the car never consumed any noticeable amount of oil. Now it decides to... The oil change has 7500-9500 mi on it. I have hard numbers but I can't remember...