PP is thinner in 5w30 and 5w30? Did you mean 5w20 and 5w30?
Thin oils *do* produce better MPG
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PP is thinner in 5w30 and 5w30? Did you mean 5w20 and 5w30?
Triple_Se7en
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Assuming you mean the 5w30, M-1 (regular) is thicker than PP. I believe M-1 cSt @ 100 is around 11.3
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If you're going to a thinner oil, is it recommended or allowed by the manufacturer?
The Viscosity Grades sheet with the grades recommended by MB when my C-Class was new in 1996 (when SG and SH oils were The Latest Things) clearly goes by temperature. Up to 90 degrees ambient, 5w30 and 10w30 (SH) were okay. Beyond that, 5W-40, 10W-40/50/60, and 15w40/50 were the recommendations. And believe me, in The Swamp, we often get past 90 for 7 months of the year.
Given that 11-year-old advice, and the knowledge that oils have only improved, should I try an SL/SM 5w30? Or even a 5W-20?
The Viscosity Grades sheet with the grades recommended by MB when my C-Class was new in 1996 (when SG and SH oils were The Latest Things) clearly goes by temperature. Up to 90 degrees ambient, 5w30 and 10w30 (SH) were okay. Beyond that, 5W-40, 10W-40/50/60, and 15w40/50 were the recommendations. And believe me, in The Swamp, we often get past 90 for 7 months of the year.
Given that 11-year-old advice, and the knowledge that oils have only improved, should I try an SL/SM 5w30? Or even a 5W-20?
Through my own experiments, I have found comparing 10w30 to 5w20(Iam one of those kooks that still like 10w30), I have found this. In my company truck a 2005 F150 with a 4.2L V6 I gain a significant advantage of gas mileage with the 5w20, more than 3 miles a gallon. With a 2002 Lincoln Continental, 4.6 Intec A gain of a little over a mile per gallon. A 2006 Dodge 2500 with a Hemi, (NON MDS) only around a 1/2 mile gain in fuel mileage between 5w20 and 10w30, and no difference with 5w30 and 10w30. I live in Florida where its hot all the time, and this is with two oil changes to compare with a variety of driving City/highway. My assumption is the littler the motor the more significant the lighter oil makes. Bigger motors use gas-period and the oil grade doesnt seem to make as big a difference because they already are overkill for power. In otherwise it doesnt work to move the oil. Ill probably use 10w30 in the Hemi from this point out now since I gain so little and Iam in a hot climate, Ill settle for the increase in the car and continue with the 5w20 in the company truck because of the big advantage.
Triple_Se7en
$50 Site Donor 2024
Panzerman
Not using 5W-20 in that Chrysler Hemi could damage parts in your engine. Not sure of the specifics... but someone here knows.
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I have two sale topics in the "Items For Sale" forum-room here at BITOG.
Not using 5W-20 in that Chrysler Hemi could damage parts in your engine. Not sure of the specifics... but someone here knows.
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I have two sale topics in the "Items For Sale" forum-room here at BITOG.
Did you not catch the NON MDS part of his post 777? They don't spec 5w-20, only the multiple displacement engines.
Mobil 1 cSt for 5w-20 is 8.8 while PPs cSt @100 for 5w-20 is 8.46. So is that what you mean by M1 is thicker? Also, MCs cSt @ 100 for its 5w-20 is 8.8 while PPs is, like I said, 8,46 but I get better gas mileage out of MC despite it being thicker at 8.8 versus 8.46 for PP. Wonder if that logic would mean I could possibly improve by going M1 despite M1 being thicker at 8.8 versus 8.46 for PP. Can anyone explain that knowing that MC is a blend of GRP II + III and PP is full GRP III? Or m I missing something else in this? Keep in mind I using a slightly oversized filter then what is recommended stock with PP to clean where I did not do that with the MC. Not sure if that has any impact.
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The 3/4 ton Dodge Rams with the Hemi still are spec'ed for the 5w20 but do not have the MDS. I called Dodge Hotline and told them I live in Florida I dont have the MDS(which is oil pressure sensitive, Iam told too heavy a oil sets off a sensor). They told me they didnt have a answer, but to call two large truck dealers in Texas that sell over half the trucks in the country and they would surely know the answer, One was Blue Bonnet, I think, the other was Gold something, anyway they both told me the Hemi engines did not change anything internally, the MDS was a oil pressure activated device using a heavier oil could cause it to act with a delayed action or not at all, they told me it would not damage anything internally it would just effect the operation of the MDS. With no MDS he told me 5w30 wouldnt hurt anything. Now since in Castrol GTX the 10w30 runs on the lighter side and 5w30 on the thicker, so I think they are about the same.(the oil spec cahrt shows the 10w30 lighter when hot). Most of the garages use 10w30, regardless of what the specs call for because its cheaper and has a one shoe fits all for most garages. I have used the 10w30 in the Hemi for 2 oil changes and the 5w30 1, the 5w20 for 2 without a difference in sound, performance and only slightly in Gas. The 10w30 sounds the quietest. Its just my imagination, but the point is we are talking about a slight variation in oil and I never take the oil to cold extremes because of the climate I live in so the 10w30 provides me with a feeling of better protection. Thats about what it comes down to.
06vtec, cold cranking numbers have a lot to do with the amount of gasoline used when an engine is cold. Some 5w and 0w oils have very low pour points/cold cranking spec's (Mobil1 0w-20 for example).
Every little bit helps. Dunno how much though. Similarly produced oils will produce similar results. If you're seeing gas mileage variation between two non group IV 20wt oils, I would believe the variance to be driving style, a few extra stop lights, etc....
Every little bit helps. Dunno how much though. Similarly produced oils will produce similar results. If you're seeing gas mileage variation between two non group IV 20wt oils, I would believe the variance to be driving style, a few extra stop lights, etc....
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