Re: Switched to synthetic oil and have a question.
[Re: gch]
#1812813
04/27/15 01:22 AM
04/27/15 01:22 AM
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Joined: Mar 2013
Posts: 571 Spring Hill Fl
65Fury440
mopar
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mopar
Joined: Mar 2013
Posts: 571
Spring Hill Fl
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I would be real careful using Synthetic in old muscle cars with flat tappet cams. Flat tappet cams REQUIRE an oil with Zinc in it. You really need a racing oil with Zinc, for instance, VR1 Valvoline, or Amsoil Dominator racing oil, Joe Gibbs racing oil. They have taken all the Zinc out of oils because it plugs up Catalytic Converters. I learned the hard way. At least put an additive with Zinc in it. This might be an interesting read. https://540ratblog.wordpress.com/ Big thread on this guy on the corvette forum.Film strength test being taken as gospel without wear and other factors taken into consideration.One guy chellenges him pretty strongly.I will provide a link if anyone is interested. I would like to read that. The logic this guy is presenting, to a layman like myself, seems to make perfect sense.
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Re: Switched to synthetic oil and have a question.
[Re: MidPenMopar]
#1813074
04/27/15 03:00 PM
04/27/15 03:00 PM
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Joined: Jan 2007
Posts: 1,032 Ohio
dobie
super stock
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super stock
Joined: Jan 2007
Posts: 1,032
Ohio
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Wow. Since I've had the motor in my car, I've used only Mobil 1 15w-50 along with one bottle of Comp Cams break in lube. In 5 years, I've changed my oil once. Just checked it yesterday, and it's still pretty clear. On average, I'll drive about 600 miles/year. To be fair though, the first several years it wasn't really driven at all. 2012 was the first year I started driving it more than just back and forth from a shop/garage. And that was late 2012, so I'll say 2013 for all intents and purposes.
1968 Plymouth Road Runner
383 4 speed
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Re: Switched to synthetic oil and have a question.
[Re: 65Fury440]
#1813082
04/27/15 03:09 PM
04/27/15 03:09 PM
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Joined: Oct 2007
Posts: 3,888 Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,888
Oregon
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I would be real careful using Synthetic in old muscle cars with flat tappet cams. Flat tappet cams REQUIRE an oil with Zinc in it. You really need a racing oil with Zinc, for instance, VR1 Valvoline, or Amsoil Dominator racing oil, Joe Gibbs racing oil. They have taken all the Zinc out of oils because it plugs up Catalytic Converters. I learned the hard way. At least put an additive with Zinc in it. This might be an interesting read. https://540ratblog.wordpress.com/ Big thread on this guy on the corvette forum.Film strength test being taken as gospel without wear and other factors taken into consideration.One guy chellenges him pretty strongly.I will provide a link if anyone is interested. I would like to read that. The logic this guy is presenting, to a layman like myself, seems to make perfect sense. I too would be interested in reading the other discussion.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Switched to synthetic oil and have a question.
[Re: MidPenMopar]
#1814570
04/29/15 02:21 PM
04/29/15 02:21 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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I agree, if you're changing oil every year at 1500 miles, synthetic is a waste. That said, I wouldn't go running to change it now, I would just run it for the year as-is.
Also, out of curiosity, why are you running 20w50? Were you getting low oil pressure with 10w30 or just jumping on the "old cars need thick oil" bandwagon?
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Re: Switched to synthetic oil and have a question.
[Re: MidPenMopar]
#1819056
05/05/15 12:49 AM
05/05/15 12:49 AM
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Joined: Apr 2008
Posts: 1,285 Pacific NW USA
CompSyn
pro stock
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pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
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A few thoughts, I wouldn't stress over the appearance of the oil in such a short time. Motor oils have heat activated additives that change appearance with normal use. Nothing to be concerned about. Here's a video from GM which I find helpful in showing folks it's very difficult to judge motor oil useful life based on color alone. I'll start the video at 1:05min to avoid the marketing on GM's OLM system. -> https://youtu.be/oi_J4SZUlSo?t=1m5s I also agree with others that 20W-50 may be overkill. Don't know the specifics of your build, but as I recall, the general rule is 9-to-10psi per 1,000rpms. You may be able to accomplish that with a decent 10W-30 and free up a pony or two in the process. Also, plenty of full synthetics with lots of Zinc in them. I'd also agree that in a seasonal driven muscle car application, synthetic may not provide a meaningful advantage. There's lots of good options commonly available. With an old school cam grind, I'd consider a 10W-30 Rotella or even a Quaker State DEFY 10W-30. With a newer fast-rate flat tappet I'd go with the specialty muscle/race oil. Also, there is one area I can think of where a top tier PAO synthetic may be advantageous in a muscle car application. That is PAO synthetics have shown an increased ability to stay within their viscosity grade when fuel dilution is a potential occurrence like for example in carbureted engines. But you won't really be able to tell you'r degree of fuel dilution without used oil analysis testing. Good Luck
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Re: Switched to synthetic oil and have a question.
[Re: Alchemi]
#1819374
05/05/15 03:01 PM
05/05/15 03:01 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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You all could have a bit of a look at service intervals on every car ever produced in the last 50 years, I have yet to see one based purely on mileage - there is a time factor in there too, this is because various parts of the oil start losing their effectiveness when exposed to heat/air/contaminates, I think 6 months OR 3000 miles is more appropriate than a year - its not like its a huge $$ thing to protect your $howevermuch to replace motor Who do you think came up with those oil change intervals? Scientists working in a lab for the good of mankind? Or was it oil companies/car manufacturers who make money every time you come in for an oil change?
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