synthetic oil for LT 5

[Vetman]

I understant Mark Haibeck recommends AMS oil synthetic for the LT 5. There are a number of types of AMS oil synthetics. Which is the best one for our LT 5 engines and is there another brand anyone else would recommend. Also, which oil filter is most effective holding oil?

[efnfast]

Marc recommends the Amsoil 10-40 high zinc. He also recommends the AC Delco AC970C oil filter. I run both of these.

[secondchance]

I use Mobil 1 High mileage 10-30. Mobil 1 High milege 10-30 has 1000 ppm of phosphorus and 1100 ppm of zinc.

[Vetman]

Amsoil had two 10-40 synthetics. one is 10-40 XL for 7.95. and the other is 10-40 premium for 10.10. The more expensive appears a little better on the test results posted. Also has a longer extended life service. Is the more expensive one necessary? Suggestions? My LT 5 is stock, 61,000 miles and runs perfect, right to 7000. Car is not raced. I just love the smooth, massive power and historic significance of the ZR-1.

[SteelBlueZR1]

I also use Mobil 1 High mileage 10-30, which Marc approves for the LT5 and is easy to find at WalMart.

[Kevin]

i've been using normal mobil one, i need to switch to high milage

[efnfast]

High zinc levels are what is important. Old oils had higher zinc levels, the new oils don't. That's why most of us run some special oil.

[HAWAIIZR-1]

I used to use AMSOIL AMO 10W-40 as recommended by Marc, but just switched to AMSOIL ZROD 10W-30 after recommendation by AMSOIL and one of their reps. A case is on the way so I have not actually tried it yet. After seeing what Yun and others are using with Mobil 1 high mileage 10W-30 I may use that instead with it being so easy to get and no shipping to pay for. I just mailed off an oil sample (Blackstone Laboratories) to see how the AMSOIL AMO 10W-40 is doing after rebuild break in and what the phosphorus and zinc actually is.

As for oil filter, check out all of Marc's research and you can't go wrong: http://www.zr1specialist.com/HAT%20W...ers%202006.htm

I bought a case of Fram TG3985 for about $2 each when Rockauto.com had their closeout so I guess I have a lifetime supply and I see Marc has updated recommendation since.

[Starman]

I use a 50/50 blend of Red Line racing and street oil. Both are high in the EP additives, but this is not a cheap option.

[Dynomite]

Originally Posted by HAWAIIZR-1

I just mailed off an oil sample (Blackstone Laboratories) to see how the AMSOIL AMO 10W-40 is doing after rebuild break in and what the phosphorus and zinc actually is.

As for oil filter, check out all of Marc's research and you can't go wrong: http://www.zr1specialist.com/HAT%20W...ers%202006.htm

Craig.......I use AMSOIL 10W-40 as Marc suggests/suggested. But may switch to AMSOIL 10W-30 (where it is colder) if it is essentially the same except for weight. Let us know what Blackstone says



Cliff