20W-50 too much?

[macmode]

I know 2 days after I put 20w50 in her my clutch went bad.

[Bosshound]

Thinner is Better. Most of your oil is at the Bottom of your Pan. It takes about 3 to 5 Seconds before you get to Optimum Oil pressure. In the mean time you have 3 to 5 Seconds of NO OIL Protecting your Motor.............That is where 90% of your Engine Wear Happens.

[BusaWizard]

it is a myth that you cannot change back and forth between standard, synthetics, and blends.

It is actually one of the more popular myths, but it is not correct.

+1000.

[Kaptain Kanji]

Yep, I would go with the manufacturers recommendation of 10w40. Personally I use
Mobil1 10w40 synthetic racing oil. Works good for me.!!

[kennym4]

Hate to thread jack, but what Amsoil should I be using 10w40 or 10w30 ?

[Rick Ekstrom]

10w40

[Endersgame]

Recommended is 10W-40. If your oil is seeing temperatures in excess of 248degF / 120degC due to mods and track use etc then there is a strong argument to using an SAE 50, as it will have more viscosity at these excessive temperatures. If your oil temp does not exceed 120degC at any time then a good "shear stable" SAE 40 is perfectly capable of giving protection. Thicker oils cause more friction and therefore more heat and they waste power and affect fuel consumption so it's always best to use the thinnest oil that you can get away with and still maintain oil pressure.

+1

[craigmpak]

hey everyone .... first post

the first number is the weight of the oil cold ... the second number is how well the oil protects at operating temperature. For example, 10-40 is a 10 weight oil that protects like a 40 weight oil at operating temperature.

Essentially, at operating temperature, 10-40 oil protects from wear exactly like a 40SAE oil ..... but with the 10-40 oil having the benefit of flowing like a 10SAE oil when cold.

Craig

[drq]

Just changed my oil to Lucas 20w-50 full synthetic from 10w-40 dino, no problems and shifts alot better.

[Bosshound]

hey everyone .... first post

the first number is the weight of the oil cold ... the second number is how well the oil protects at operating temperature. For example, 10-40 is a 10 weight oil that protects like a 40 weight oil at operating temperature.

Essentially, at operating temperature, 10-40 oil protects from wear exactly like a 40SAE oil ..... but with the 10-40 oil having the benefit of flowing like a 10SAE oil when cold.

Craig

Actually the W stands for Winter Not Weight

[busaville]

Actually the W stands for Winter Not Weight

REALLY? ???...

[MetalDisorder]

WOW how many years do I have to be on earth before I know everything

I always thought it was designating weight ???
From WIKI

"The Society of Automotive Engineers (SAE) has established a numerical code system for grading motor oils according to their viscosity characteristics. SAE viscosity gradings include the following, from low to high viscosity: 0, 5, 10, 15, 20, 25, 30, 40, 50 or 60. The numbers 0, 5, 10, 15 and 25 are suffixed with the letter W, designating their "winter" (not "weight") or cold-start viscosity, at lower temperature. The number 20 comes with or without a W, depending on whether it is being used to denote a cold or hot viscosity grade."