10w-30 mobil 1 here. It sees 5700 rpms at times and lots of cold starts.

Rich

 

do you realize what you've done !!!! I'm surprised your motor has'nt "let go" already.

I made it to 7K miles this weekend using motorcraft 5W-20.......how many miles on your truck Rich ?

 

the 5w-20 oil is primarily intended to provide improved fuel economy vs the more conventional 10w-30.

10W30 "should" not cause a problem, but what do you gain by not following the Mfg. recommendations?

engines today are a far cry from what we had years ago. Another point to consider is the very different tolerances held within modern engines, and the possible repercussions of running a too heavy oil. One very real repercussion would be decreased flow across the bearings. As engines advance, companies are reducing clearances, and gaining the ability to run lighter oils. When we add the heavier viscosity oil, the pressure shown on the gauge may go up, but the actual flow rate across the bearing may drop below what is needed to remove heat from the bearing, and can cause bearing failure. ......Now, I would say there is a margin involved and that margin may fall within acceptable "range" with 10w-30.........spun bearing http://www.smartsynthetics.com/artic..._and_honda.htm


My 2 cents on oil .....switch to synthetic....its the best protection against wear vs. conventional., I'm planning on switching at 7.5K. probably 10W-30.

sorry for the conflicting answer...... I like to ramble

 

"FYI, the first number is the weight, the second is the temp at which it will start to get thicker. So going from a 5W-20 to a 5W-30 will only affect you if you start the truck up between 20 and 30 degree ambient temp."

Nooooooooooooooooo!


"The Society of Automotive Engineers Viscosity Classification

The terms SAE 10W-30 and SAE 15W-40 are widely used. How many people actually understand what these terms mean?

Firstly any viscosity grade should be proceeded by the initials SAE. This stands for the Society of Automotive Engineers and indicated that the following viscosity classification refers to their definitions. It should be noted that SAE is not a performance category it only refers to the viscosity of the oil. When comparing oils the reader should not only compare the SAE viscosity grades of two oils but also the engine performance classifications in order to be able to fully compare performance.

Let us consider the following: SAE 15W-40.

The fact that this classification has two parts; the 15W and the 40 indicates that the oil is a multigrade. The first number with the suffix 'W' indicates the oil's performance at low temperature. In fact the 'W' stands for winter. The lower the 'W' number the lower the viscosity of the oil. Therefore an SAE 5W oil is a lower viscosity oil than an SAE 10W oil.

The number after the W, in the above case '40'; gives a measure of the oil's viscosity at high temperature. Again the lower the number the thinner the oil is at high temperature. So an SAE 30 is a thinner, or less viscous, oil than an SAE 40.



A multigrade oils is an oil that has two parts such as SAE 15W-40, or 20W-50. A monograde oil only has one part, such as SAE 30, or SAE 40.

The Chevron Supreme Range of Motor Oils offer wide range of viscosity grades to cover the wide variations in temperature experienced by the end users.

Below is a comparison of the range of operating temperatures suitable for the various viscosity grades.

The choice of viscosity grade is a difficult subject. The manufacturer's recommendations should be followed. If this not available then your Chevron dealer can help you select the correct grade. Common questions are asked."



I live in one of the hottest places in the USA: middledamn GA where summer temps exceed 100 degrees F often while we also get down to the 'teens' in the winter time. I drive my '01 L daily and it now has about 83,500 trouble-free miles on it. I started using RP's synthetic oil(5W20) at its 4,000 mile mark. It has been dynoed and 1/4-miled a few times too.

Dan

 

27,9xx

Red, I was a powertrain engineer on the modular motors for almost 6 years. So... yeah I kinda know what I'm doing.

Rich

 

what OIL FILTER does everyone run and why?

 

Wix filters, I have only heard decent things about them, and have always used them.

 

pure-o-later "pure one". It's got a thick casing and premium materials.

Run it on all my cars. (meijer in town carries a good selection for $4-$5 dollars)

Rich

 

Motorcraft filter with 5W30 Mobil 1 synthetic oil

I've only got 2,500 miles on my truck and she runs like a champ.

Steve

 

I used the motorcraft filter as well.