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Got over 25000 miles on it in less than 2 years! The motor block is bulletproof. I did break 3 valve spring. REV 1116 double springs. I recent got a whole new set of REV springs, seals, bases, retainers and had them shimmed. It's the new REV 1116 chrome dual springs made in Argentina. It's real...

If you use synthetics, you can go for 7 months with changing. I would rather not think about changing oil for a longer period of time unless you are like some guys who love changing their oil.

If you were climbing a long grade, and your coolant temp guage was nearing the red, which oil would you rather have?

427 c5r blocked LS1 consumes 1 qt every 1000 miles. I carry a qt of oil in my engine compartment with a funnel and keep it topped up when I get gas. I personally think adding oil is good for my 6000 mile OCI because it freshens it up.

Makes total sense. Towing - overheated oil Heavy Commercial Use - delivery stop and go Operating in Dusty Conditions - dirty air filter/oil Off Road Operations - dirty air filter/oil

I have a 427 C5R blocked motor that has over 25000 miles on 15w40 Royal Purple without any problems. My friend has a 15000 mile 427 C5R blocked LS1 with an 5lb ATI blower, and he has spun bearings, and his camshaft is wornout. It's getting rebuilt now. His is mostly street driven miles, while...

Your older car is built with much larger tolerances than current engines. So you get a lot of blowby, and should change your oil more often. Yes I do often clean out my cylinders and pipes with WOT blasts too. A cloud of dust and high ole silver away!

427Z06, I also have a 427 c5r blocked engine with over 25000 miles already. Currently it is running with 15w50 and my oil pressure is a little higher than it was running 15w40 Royal Purple. Around 45psi at 2500rpm. The oil galleries are larger with the c5r block, and with the larger tolerances...

If you put a drop of dirty oil on a white towel, you can see the carbon. It's smaller than your oil filter's capability so it goes right thru it. Unless you got a bypass filtration system, it will get darker and darker.

Call the motorycycle dealers. Most of them have Motul.

Keep an eye on your oil pressure guage. If it is dropping too much by getting too hot and thinning out, change the oil and increase the viscosity. Also overfill it by half a quart so you don't loose oil pressure in the turns. [ June 05, 2004, 12:13 AM: Message edited by: pedaltothemetal ]

I think your break in dino oil was thinner than the M1 you are now using. Oil pressure is not only an indication of flow, but of viscosity. Leo

Here is your answer. 0w is thinner than 5w so his Amsoil cold start oil pressure is lower than the 5w30 Mobil 1. At normal temperatures the 0w Amsoil is still thinner. Notice when he gets on it, the oil pressure goes up slower. Therefore there is more oil being pumped thru the engine with the...

If you go racing a lot be prepared for something to eventually break. Your car is very heavy and a lot of stress will be placed on your drivetrain. I wouldn't be surprised if you trans goes first. Your rearend can break without warning also. But your engine will unlike die if it's just stock...

I observed all of your observations with Royal Purple 15w40 when I switched from Delo 400. I've been waiting to hear what other brand will give me similar results especially more power. Now that you mentioned 15w50 Mobile 1, it's going to be on my list when I go oil shopping. Leo

I did notice this too. It's got to do with the oil filter not filtering as efficiently anymore. I changed the filter, and my oil gradually cleaned up. Leo

I get 22 psi a hot idle. Mine is a A4 and idles at 900rpm because of my stall. After what happened to you, I'm always looking at my gage now. An oil cooler would be an excellent idea for road racing. Also a 160 tstat, and custom tune the fans to come on earlier. Leo

I think you can only get so much iron in UOA cause the particles precipitate onto the bottom of the oil pan and gets stuck on the magnetic drain plug, or sucked into the oil filter. I always find a fine grey iron powder on my magnetic drain plug. Leo

Hi Mike, Keep an eye on the oil pressure gage. I'm using 15w40 RP now, and this hot weather is causing a drop of 3psi from the norm. I think it's important to find the right oil for the temps your oil will see. So if you see a drop in the pressure while you are racing, I would increase the...

I just changed my oil based on my oil pressure gage. If the pressure is consistently lower than normal when the oil gets to normal operating temps, then it's time for a change. After I change my oil yesterday, the pressure is back where it should be. The reason for the lower pressure is the...