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I’m in Alabama. Maybe Royal Purple 10w40 would be a better choice?

I have a 1984 Ford LTD police interceptor with the 5.0 H.O 302 engine. The car is basically a 4 door Mustang. I tend to drive it pretty hard, I just drove about 6 miles with the pedal held to the floor. The engine naturally generates a lot of heat, would M1 15w50 be too heavy for this engine...

Thanks for the responses. So Mobil 1 15w50 should be sufficient? I believe it has 1300ppm. I am planning on using it in an 85 Ferrari Mondial with a 2.9L flat tappet v8. My mechanic uses Pennzoil Euro 5w40 (in everything), but I believe it only has around 800ppm.

What is the ideal zppd content in a motor oil for a flat tappet engine?

I would love to use a track. Unfortunately there are no suitable tracks in my area that are available to the public. Me and a friend are in active negotiations currently with a small airport. We would like to rent it for a few hours once a month and host an event similar to this...

That GMT400 was my first vehicle as a teenager. My dad bought it new and it got passed down to me. I sold it like an idiot in the mid 2000s but was able to track it down and buy it back. It was in pretty rough shape but luckily I was able to restore it before it ended up in the junkyard. Here...

I need about 3 miles, I have a secret spot that is suitable after midnight.

I am taking it to an independent mechanic in a neighboring state. The majority of dealerships do not have old enough techs to be experienced with the classic cars. As for what oil do they use, I have actually asked 3 different techs and received 3 different answers. 1 recommended whichever 10w40...

Roughly how much of an effect would going up, or down, one weight of oil have on engine oil pressure at operating temperature? For example going from a 10w30 to a 10w40, or a 5w50 to a 5w40 etc. Is the effect significant or, typically, negligible?

I use Pennzoil Euro 5w40 in my 85 Mondial with the 2.9, but I’m under the, perhaps mistaken, impression that the flat 12 does better with a heavier oil if you drive hard. M1 5w50 might be a good choice, but I have heard it sheers down quickly.

Another potentially dumb question. Would the thicker oil on cold days not effectively squeeze into tight clearance and cause more wear until it reached operating temperature?

I don’t believe it says anything else. I could be mistaken, but I believe the factory fill was conventional.

I actually ran M1 15w50 my last interval. However, I was concerned it was a little too thick in the winter. The car has two large oil coolers without thermostats, so when the temperature is below 50F it’s hard to get the oil up to temp. The oil pressure was running a bit high on cold days.

Owners manual in my 88 calls for 10w50. However, the very next year Ferrari started recommending 10w40, mainly because I believe they switched oil partnerships and the new company didn’t offer a 10w50.

Actually the Testarossa flat 12 has a reputation for being one of most durable engines Ferrari ever made. My mechanic trained on them when new and said they are almost indestructible. One of his current clients has surpassed the 300k mile mark. The gearbox on the other hand was a tad weak...

Thanks for the reply. What oil would you recommend?

I have a 1988 Ferrari Testarossa that is going in for a major service in December. I changed the oil last October using Redline 10w50 and I’ve put around 2000 miles on the car since then. Would there be any issues leaving the oil in until December as they will have to drain it for the service...

This is a sheer curiosity question. Do piston rings make contact with the cylinder walls or does oil prevent metal to metal contact? I just can’t see how rings can seal without metal to metal contact. And if there is metal to metal contact, how are rings not worn out extremely quickly? If oil...

I dumped the original oil, then ran mobile 1 for 500 miles or so. Dumped it and them ran mobile 1 again for 1000 miles and collected the sample.