mobil 1 full synthetic high mileage gasoline in diesel?

[somerandomguy1]

A "score of dispersants"? I guess that's not surprising if you're trying to read the tea leaves of typical PDS values and YouTube videos instead of picking an oil for a diesel engine by the diesel license or specification. You don't know the difference between viscosity and viscosity index, yet you are ranking oils by their dispersant score.

viscosity equals 0w40 number and vi equals 180 in m1 0w40 fs ecf

 

[kschachn]

viscosity equals 15w40 number and vi equals 180 in m1 0w40 fs ecf

No clue here, sorry.

 

[somerandomguy1]

No clue here, sorry.

This chart from mobil 1 helps.

 

[kschachn]

Yeah I know those charts. That isn’t what I meant, I couldn’t understand your post or question.

 

[somerandomguy1]

Yeah I know those charts. That isn’t what I meant, I couldn’t understand your post or question.

What I asked equaled basically that if m1 0w40 fs ecf with hths 3.6 would suit a diesel engine?
also how come some oils have high VI of 180 such as m1 0w40 fs ecf yet some lower VI oils with a VI of 165 such as lucas tech 0w16 have a lower viscosity?

 

[kschachn]

What I asked equaled basically that if m1 0w40 fs ecf with hths 3.6 would suit a diesel engine?
also how come some oils have high VI of 180 such as m1 0w40 fs ecf yet some lower VI oils with a VI of 165 such as lucas tech 0w16 have a lower viscosity?

Because you don't understand what viscosity index means. High VI is not always a good thing.

 

[somerandomguy1]

Because you don't understand what viscosity index means. High VI is not always a good thing.

I wonder which would go better with a 1990 toyota corolla 1.8 diesel
m1 0w40 fs ecf ; 40 percent PAO, 3.6 hths, 1700 pm ZDDP, usd 25 5 quart jug, VI 180
m1 15w50 fs; 10 percent PAO, VI 160, usd 25 5 quart jug
m1 10w40 high mileage; 5 percent PAO, 50 percent GTL, VI 160, usd 25 5 quart jug, hths 3.9

 

[kschachn]

I wonder which would go better with a 1990 toyota corolla 1.8 diesel
m1 0w40 fs ecf ; 40 percent PAO, 3.6 hths, 1700 pm ZDDP, usd 25 5 quart jug, VI 180
m1 15w50 fs; 10 percent PAO, VI 160, usd 25 5 quart jug
m1 10w40 high mileage; 5 percent PAO, 50 percent GTL, VI 160, usd 25 5 quart jug, hths 3.9

An oil of adequate HT/HS that carries a proper diesel rating for the engine.

 

[somerandomguy1]

An oil of adequate HT/HS that carries a proper diesel rating for the engine.

These 3 M1 oils are diesel CF rated at least if not higher and the owners manual calls for diesel CD as shown in a previous post in this thread.

General information found on the internets recommends an HTHS of 3.5 at least for diesel engine. M1 Ow40 and the M1 HM and the m1 15w50 fs comply with this; m1 15w50 having the highest HTHS of 4.5.
So all three of these would comply with and adequate HT HS and diesel rating.

For leak prevention i suppose the m1 high mileage and m1 15w50 fs would fare better than the m1 fs ecf 0w40 with VI 180.

 

[OVERKILL]

What I asked equaled basically that if m1 0w40 fs ecf with hths 3.6 would suit a diesel engine?
also how come some oils have high VI of 180 such as m1 0w40 fs ecf yet some lower VI oils with a VI of 165 such as lucas tech 0w16 have a lower viscosity?

VI (Viscosity Index) is a calculated value based on the difference between the 40C and 100C viscosities. It's designed to portray the rate of change of viscosity with temperature. Different base oils have different natural VI's, so for example Group II has a VI below 120.

To increase VI of a finished lubricant, Viscosity Index Improvers (VII) are added to the base oil blend, which increases the 100C visc, pushing it up, while having less effect on the 40C visc, changing that slope and thus increasing the VI. Years ago there was a brief period where oils with extremely high VI's were in vogue. These would be blended with extremely light base oils and with a tremendous amount of VII in them. Presently, there's a crowd on here that likes the opposite approach, oils with a low VI, and thus little VII.

A 0W-40, because it has to meet both the requirements for the 0W-xx Winter rating and the 40 grade at 100C, will have more VII in it than a 0W-16, which has a narrower spread between the Winter rating and the grade. While PAO can do a lot of work in reducing the VII requirements in an oil of this type, ultimately you are still limited by CCS and MRV so your base oil blend will likely be lighter than a 5W-40 for example (not always the case, cost cutting can change that).

If you look at Ravenol's 0W-16, it has a VI of 156, pointing to less VII than Lucas.

 

[somerandomguy1]

VI (Viscosity Index) is a calculated value based on the difference between the 40C and 100C viscosities. It's designed to portray the rate of change of viscosity with temperature. Different base oils have different natural VI's, so for example Group II has a VI below 120.

To increase VI of a finished lubricant, Viscosity Index Improvers (VII) are added to the base oil blend, which increases the 100C visc, pushing it up, while having less effect on the 40C visc, changing that slope and thus increasing the VI. Years ago there was a brief period where oils with extremely high VI's were in vogue. These would be blended with extremely light base oils and with a tremendous amount of VII in them. Presently, there's a crowd on here that likes the opposite approach, oils with a low VI, and thus little VII.

A 0W-40, because it has to meet both the requirements for the 0W-xx Winter rating and the 40 grade at 100C, will have more VII in it than a 0W-16, which has a narrower spread between the Winter rating and the grade. While PAO can do a lot of work in reducing the VII requirements in an oil of this type, ultimately you are still limited by CCS and MRV so your base oil blend will likely be lighter than a 5W-40 for example (not always the case, cost cutting can change that).

If you look at Ravenol's 0W-16, it has a VI of 156, pointing to less VII than Lucas.

found at wikipedia entry for base oil: "Group IV base oils have a viscosity index range of 125 - 200. Poly-alpha-olefins (PAO) oils have a higher oxidative stability in extreme temperatures, and also have exceptionally low pour points, which makes them much more suitable for use in very cold weather (as found in northern Europe), as well as in very hot weather (as in Middle East)."

Here in Nicaragua weather gets relatively hot.