I heard RP 5-30 may be too thin so would 10-40 is better for the VQ?

 

I have seen no RP that is any good. Every Z I have seen here in AZ burns a quart every 500 miles.

Go with another oil IMO.

 

5w30 and RP sucks. Use a different oil.

 

I ran 5w-30 RP in my 06 since I bought it.
I don't know where the negative sentiment is coming from.

 

I run RP 5-30.... never heard any bad things about it. A lot of people in the forums use it

 

What does your manual recommend? Great little book.

 

It really didn't do very well on the oil analysis Resolute's been running. I tried it....currently running M1 0-40. Next is Castrol 0-30 German

 

I have been using RP 5W-30 in my 2006 Z since I got it new in august 06. no problems whatsoever...

 

RP sucked in my car! I have no complaints on amsoil tso ow-30 i cant say enough about this oil and has blakstone labe reports that show great things on this oil.

 

their off the counter oil is very average and dangerously thin.

their race oils are pretty good from what i have read.

mobile 1 0w40, german castrol 0w30, pennzoil 10w30 are great for the vq and all can be had off the counter

amsoil 0w30 is a bit harder to find but it is another great choice.

 

ive been using rp for the last 2 years and not 1 problem

 

My Z drinks Amsoil 0w-30 because its so thin

RP never burned a quart when I used it.

Using German Castrol Syntec 0w-30 now.

 

RP 5W-30 sheared down to a 20 weight oil in four different engines. It also showed higher than average wear in all four engines, and was not a very good oil considering the price.

RP has since reformulated their 5W-30, and it is more robust. Only one person has tried it and posted a UOA. Their mileage was average for the previous samples, but the wear was a lot lower with the new oil. It also stayed in grade.

The new formula looks to be a lot better, but with only one sample, it's still hard to say it's worth the money. Especially when you consider that the average of four Castrol GTX 5W-30 samples have much lower wear than even the new version of RP 5W-30.

Only one person has used RP 10W-40 and had it tested. It also sheared in the VQ, to a really thin 40 weight. Copper and Lead were much higher than average for the mileage put on the oil.

If you change your oil every 3k-5k miles, I couldn't see spending the money on RP when there are better options for less money.

Will

 

According to this test, the results show that RP is one of the best.
http://www.animegame.com/cars/Oil%20Tests.pdf
I can't say the validity of the testing method though.

 

This was discussed in the UOA/Oil Data sticky. The test was not done correctly for starters. But it doesn't matter, because the Timken Load bearing test they tried to duplicate hasn't been used since the 70's for engine oil testing. The API and other organizations have already confirmed that the Timken test has no indication of an oil's performance in an engine, and to make it worse, Street Commodores came out and said they should not have published the test after all the criticisms they received about their botched job. The links for all this information are in the sticky.

The Timken test, when actually done correctly, is designed to reveal the presence of any Extreme Pressure additives in the oil or grease. RP would do well in this test because they use a sulfur additive as a surface hardener, which explains the typically high copper wear found when using RP oils, since sulfur is corrosive to yellow metals.

Will

 

The tests that Resolute speaks of are actual samples from Z owners sending off for an analysis

Great thread and it influenced my decision this current oil change.

 

Mobil 1 0w-40 full and true synthetic. (European Formula)

 

Personally I would stay away from RP especially if you are going to be racing your Z. I had 55,000 thousand miles when my motor spun a bearing. I had been using RP since I had 1,200 miles. When inspecting my main bearings they had the wear of a motor that had 120,000+ miles. Granted I did race my Z but other Z's that raced with me had there engines go to 100,000 miles but they were using mobil or other synthetic brands.

 

Ive been usin rp 5w 30 since i bouht my car an have ha no problems but i was wonerin if anyone knew anythin about the racin 51 oil they make?

 

I used RP 5-30 and I was very happy with the performance, milage and life. It didn't burn off fast like the M1 and I never had problems with oil burnoff, so I can't really help you out. I'm running amsoil, very good oil like it better than RP and it has a great rep.