The Workhorse manual says 5W-30 is the preferred oil for the 8.1 L Chevy engine. I've never used that weight before. What is the wisdom of the forum?
Would you switch to a synthetic oil on the first oil change? If so, which one? Please keep in mind that we have to get the oil changed in "far off places" as we travel in the northern US and Canada during the summer.
Thanks in advance for your opinions and suggestions.
Tom & Sarah
2015 Meridian 36M
2006 CR-V toad
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pulsar, Our 2000 V-10 also calls for 5w-30 oil one reason is better fuel economy and the other is the newer computer assembled engines have closer tolerances. Regarding a change to synthetic, the Ford V-10 engine takes 7 to 10 thousand miles before it's completely broken in. Don't know about the 8.1 vortec. I waited until I had 13,000 miles before I switched to Mobile 1 Synthetic and stayed with the 5w-30.
Good luck, C. Jim
Jim & Sherry Seward
Las Vegas, NV
2000 Residency 3790 V-10 w/tags & Banks System
2003 Suzuki XL/7 toad
Generally, if the owner's manual recommends 5W-30 oil, it also says that 10W-30 is OK. Follow what the manual says. 5W-30 gives very slightly better fuel mileage and is better in very cold climates than 10W-30.
Folks will tell you all kinds of goofy stuff about oil--"5W-30 is too watery," "You need (blankety blank) for REAL protection," "My Daddy used (such & such) for forty years, and that's all I use." Forget all that. Follow the owner's manual.
Synthetics--that's a topic for heated discussion. In any case, it won't hurt if you wait until 5,000 or 10,000 miles, run it the full interval shown in the owner's manual, and if you're on the road, probably Mobil 1 is the best choice due to the wide distribution.
I would stay with the 5W30 oil until you get some serious mileage. Switch to synthetics, as was stated above, when about 10K miles. I have switched to 15W50 Mobil1 synthetics recently to my Suburban for towing in the summer. I have about 80K on it. I think this weight oil would provide better lubrication in the hot summer under heavy towing conditions. Since I use the Suburban for mostly towing the trailer I don't worry about the oil in the winter.
*This Message was edited on 24-May-02 12:48 PM by Camping Joe*
With modern oils, we no longer need higher viscosity for higher film strength, especially with synthetic lubes.
Viscosity needs to be selected for the size space that it needs to flow into in the bearings. At 80k, your 'burb shouldn't be very worn. I think that 10W-30 would give you better lubrication and less wear than 20W-50. Most wear occurs when the engine is started and before the bearings have a chance to create the hydrodynamic layer of oil that keeps the metal surfaces apart. The thick 20W-50 will not flow as well in the cold engine. 20W-50 is for racers with engines that run at maximum heat for the whole race.
Boy howdy, do you ever open up a "can-o-worms" with this one. Opinions on oil are like body orifices. (Everyone has one, and they all stink except mine!!!!)
I don't follow the "break in" theory. If new engines need to be "broken in" why does GM put Mobil 1 into the Corvette from the factory?
Watery oil.... When it's cold, you want the oil to flow freely. When it's hot, you want the oil to be a bit more viscous. (Thus the term viscosity!!!).
5W-30 means that when it's cold it flows easily, when it's hot it is 30 weight.
For what it's worth, (nothing really) I use Mobil 1 0W-30, and have since it came out a few years ago. It really works well in sub-zero temps. I don't think that it is even sold in areas where it get hot (like south Texas) so if I lived there, I would use Mobil 1 5W-30 instead.
I agree that most wear occurs on engine start, but for those that live in Denver knows the mountain passes here in Colorado. Going up to Eisenhower Tunnel from Denver is like running at maximum for an hour and not to mention the other passes one is likely to encounter on the trip into the mountains. I appreciate the fact that under normal circumstances I would only need 5W30 or 10W30, but I use this vehicle mostly for towing. I can see not running 15W50 oil if I used this vehicle as an everday vehicle (including winter season). I don't think you get as good of lubrication when you are running with those hot of conditions under the hood. I think I would get more metal to metal contact when running at high temp (many hours of driving)than at startup with low viscosity oils. You are probably right that I can run with 10W30, but I am in better range with the 15W50 weight oil.
*This Message was edited on 24-May-02 12:49 PM by Camping Joe*