what's the difference? i usually buy 5w30 but i ordered some order and they sent me 10 w 30. should i just put that in my truck or does it make a big difference. my truck has 11,000 miles.
its royal purple synthetic oil.

 

Dump it in. 26K and never been in the shop.

 

Where can i order some of that brand of oil ?

FRITZ, Stock Silver 2001 "L" BaBolt's s/s tips

 

www.jegs.com

 

10 w 30 is better protection

 

Spade$: Huh? Do you mean protection on cold starts, or in terms of longevity of the oil. Please explain.

Here is what I think:

The first number is the cold viscosity. A 5 weight would flow more easily that a 10. I would think a 5 would be more easily pumped to the top end on a cold startup.

The second, "w" means it's a multigrade, if I remember correctly.

The third, "30" in both cases here, is the warmed-up "hot" viscosity. Both would have the same here.

The spread between the first and last numbers is an indication of the amount of the fragile long-chain viscosity index improvers added to the formulation. A 5-30 has had more of these added, and is more suspectible to breakdown than a 10-30. The 5-30 base stock would break down (suffer viscosity reduction) more quickly than a 10-30.

 

hugo,
if you come here often enough, you will see that there are a wide variety of opinions on this topic. My opinion is that you use what you were sent. Its Spring and you dont live in the Great White North so cold startup shouldnt be a huge issue.. I run 5W30 Mobil 1 and am happy with it...
dboat

 

5W 30

 

Royal Purple #11(5W20) Racing oil. It's been 'red-lined' many times too as well as driven daily.

Dan

 

thanks, i think i'll just dump it in and see if there's any difference. if i notice something different i'll be sure to post it.
hugo

 

Use an Amsoil 5w-20 or a 5w-30 its a better synthetic and its cheaper than royal purple!! I have 20,000 on my L and 300,000+ on my work truck with Amsoil and never any problems!!!Just my .02 cents worth!!