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I wouldn't run pennzoil anything, that oil aint no better than quaker sludge. The problem with them is they are both derived from Pennsylvania crude which is in fact one of the purest unrefined oils in the world, however it also has a parafin base which tends to cause sludge, you will be ok so long as you go back and buy more every 3k miles, but if I were you I wouldn't run it over 3.5k. mean while at 8k miles my castrol is still going strong
Not only are they high in paraffin wax but they are also very high in resin content.
That was then this is now, like I said Pennzoil is removing the paraffin out of their oil now so it is a mute issue, and by doing that they also take the resins with it. Resins and paraffin go hand in hand, if you have paraffin you will have the resins the paraffin create. Pennzoil had major issues with paraffin and resin build ups in the late 80's and early 90's but is not an issue anymore. I've seen what it would do to an engine, would plug everything. For me Pennzoil is like dealing with a person that lies, it's gonna take a long time before I can trust them.
Oh I'm not ignorant on the issue, Pennzoil has just left a bad taste in my mouth due to their previous years..... and maybe because it's the main oil for Jiffylube and they just plain suck.
Shot in the dark here but since heat is the biggest source of viscosity breakdown I'll go with that. Plus the 5W-30 has to contend with a broader range of kinematic viscosity energy so it must work harder to lubricate the engine.
You're partially on the right track. The Viscosity Improvers are the first thing to shear and the larger the variance in the weights the more of them that are required. As a result, 5w-30 oil is less resistent to shear (I believe mechanical, chemical (fuel) and heat all apply) so it will thin easier.Ironically, there are thick 5w's and think 10w's that are nearly impossible to tell apart. I was advised to run 10w-30 in my car because it would be nearly impossible to prove the original viscosity in testing if it were every in question. I have opted to stay with the factory recommendation so far. Synthetic oils, especially Group III and IV contain the least amount of Viscosity Improvers because they have more of a natural tendency to change grades.
It is viscosity characteristics not the true weight of oils viscosity, that's why some oils with the same viscosity ratings seem to be heavier than another brand.
Yeah it can get pretty confusing, 5w does not really have a viscosity of 5 as 30 does not have a viscosity of 30. What the numbers mean is the oil has the characteristics of 5W-30. Does that clarify what I'm saying? The numbers on the bottle are for consumer information so they/you know which oil has the proper characteristics.
Those are some huge welds!
the W in 5w 30 stands for winter not weight
just because you have been doing it that long doesn't mean your righthttp://www.machinerylubrication.com/Read/171/oil-canspecifically near the bottom ill quote "Achieving the high Viscosity Indexes required by modern motor oils has been accomplished by adding VI improvers to create multigrade oils such as 10W-30. The W signifies winter and is the oil’s low temperature characteristics, while the higher number gives the oil’s high temperature viscosity properties. A 10W-30 oil behaves as 10-weight oil at low temperatures but gives the protection of 30-weight oil at the high engine operating temperatures. Viscosity Modifiers or VI improvers are high molecular weight polymers that remain inert at low temperatures. As oil is heated, they expand to help the oil maintain its viscosity.Low viscosity base oil fortified with viscosity modifiers can perform well at low temperatures. If the viscosity modifiers break down under high shear conditions, the oil offers impaired protection at high engine temperatures. The development of shear stable viscosity modifiers has improved significantly over the years.look at chart on page.
just because you have been doing it that long doesn't mean your right
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