Since I have 2 vehicles that get 5w30 and one that gets 5w20, I was wondering who is running 5w30 or higher in a 5w20 spec'ed engine and what are the results? It would be nice to use one viscosity.
Who is running 5w30 in an engine spec'ed for 5w20?
- Thread starter PT1
- Start date
- Status
I'm running Fuchs Titan SuperSyn LongLife 5w30 in my Grand Marquis, that's spec'd for 5W-20.
Considering there have been no changes in the internal tolerances of this engine since 1991, when 10w30 was the default standard, I don't know how 'valid' my results would be through. What I'm running is also a fuel economy oil, despite the HTHS of 3.5.
Considering there have been no changes in the internal tolerances of this engine since 1991, when 10w30 was the default standard, I don't know how 'valid' my results would be through. What I'm running is also a fuel economy oil, despite the HTHS of 3.5.
If you want to try a 5-30 in your vehicle that calls for 5-20, a safe and sane thing to do is use the 5-20 in the winter, and 5-30 in the summer. Or you could mix the same brand.
There is not a huge difference, but there will be added protection because of the thicker oil with the high temperatures encountered by the engine in summer.
Do you need it? No. Possibly if you are towing or racing.
There is not a huge difference, but there will be added protection because of the thicker oil with the high temperatures encountered by the engine in summer.
Do you need it? No. Possibly if you are towing or racing.
I run 5-30 in all of our gasser fords in the family. I'm sure 5-20 is great but with such great luck with Redline 5-30 i wont be changing.
Our family has 7 5-20 spec ford trucks including 3 V10's, 2 02 F150's 1 lightening, and out 07 5.4. All running 5-30
Our family has 7 5-20 spec ford trucks including 3 V10's, 2 02 F150's 1 lightening, and out 07 5.4. All running 5-30
5W30 with a quart of MMO substituted for one quart of oil during cooler times of year will work.
I wonder how much difference in viscosity there has to be to see a mileage difference? Not grade, actual viscosity. If you look, some 5w20s are just a coupla ticks below the bottom of grade 30 and some 5W30s are just a few ticks above. I can't imagine swapping from one to another in this case would amount to much at all. On the other hand, going from a middle level 5W20 to a 5W30 just a few ticks below grade 40... that might make a diff.
Originally Posted By: toyotaguy
I am running 0w30 in my toyota. And it runs just fine with 47,000 on the clock
That a thick oil - nothing at all t do with a xw-20wt except fopr flow properties below -30degC.
I am running 0w30 in my toyota. And it runs just fine with 47,000 on the clock
That a thick oil - nothing at all t do with a xw-20wt except fopr flow properties below -30degC.
Originally Posted By: toyotaguy
So is there any real benifit to using the 5w20 instead of the 5w30? Im no oil specialist, but I don't see it
Less vii varnish and sludge. a good 5w-20 require little vii, a 5w30 a LOT.
So is there any real benifit to using the 5w20 instead of the 5w30? Im no oil specialist, but I don't see it
Less vii varnish and sludge. a good 5w-20 require little vii, a 5w30 a LOT.
I've run 0w30 amsoil in my 07' mustang GT 4.6L 3V since 10k miles. I now have 50k on the car. Several cam swaps and the cams/followers show no wear and zero sludge/buildup of any kind on the heads/covers. These motors are (supposedly) susceptible to vvt issues when you go to a higher viscosity oil (than 0w20) but I've had none.
Last edited:
Varnish would be on the ring land area of the piston. Less vii=less varnish all else being equal. With high detergency in modern "syn" oil may be less of an issue. Needing high detergent load reduces EP and AW effectiveness /activity. Its a compromise package - it has to be unless you are running a specialty racing oil with expensive basestocks - and even then .....
Last edited:
The Amsoil SSO would be my choice if I was going to run a 30 grade oil in an engine spec'd for a 20 grade. It is one of the thinner 30 grades. Edge would be another good choice for something off the shelf.
- Status