Engone oil

[johnboy]

Quick question, what oil do you guys run in the redtop engine, I'm using 10/40 semi but someone said the other that I should be using 15/40 semi, always used 10/40 me self.

[robah]

I have bought "Fuchs TITAN SYN MC 10w-40 High Performance Semi-Synthetic Engine Oil" via Opie Oils as that is the grade (10/40) that they recommend for the engine.

I suppose it is done to the user as it's not much difference in viscosity.

copied from Wikipedia.

Multi-grade[edit]

The temperature range the oil is exposed to in most vehicles can be wide, ranging from cold temperatures in the winter before the vehicle is started up, to hot operating temperatures when the vehicle is fully warmed up in hot summer weather. A specific oil will have high viscosity when cold and a lower viscosity at the engine's operating temperature. The difference in viscosities for most single-grade oil is too large between the extremes of temperature. To bring the difference in viscosities closer together, special polymer additives called viscosity index improvers, or VIIs are added to the oil. These additives are used to make the oil a multi-grade motor oil, though it is possible to have a multi-grade oil without the use of VIIs. The idea is to cause the multi-grade oil to have the viscosity of the base grade when cold and the viscosity of the second grade when hot. This enables one type of oil to be used all year. In fact, when multi-grades were initially developed, they were frequently described as all-season oil. The viscosity of a multi-grade oil still varies logarithmically with temperature, but the slope representing the change is lessened. ^{[clarification needed]} This slope representing the change with temperature depends on the nature and amount of the additives to the base oil.

The SAE designation for multi-grade oils includes two viscosity grades; for example, 10W-30 designates a common multi-grade oil. The first number '10W' is the viscosity of the oil at cold temperature and the second number is the viscosity at 100 °C (212 °F). The two numbers used are individually defined by SAE J300 for single-grade oils. Therefore, an oil labeled as 10W-30 must pass the SAE J300 viscosity grade requirement for both 10W and 30, and all limitations placed on the viscosity grades (for example, a 10W-30 oil must fail the J300 requirements at 5W). Also, if an oil does not contain any VIIs, and can pass as a multi-grade, that oil can be labelled with either of the two SAE viscosity grades. For example, a very simple multi-grade oil that can be easily made with modern base oils without any VII is a 20W-20. This oil can be labeled as 20W-20, 20W, or 20. Note, if any VIIs are used however, then that oil cannot be labeled as a single grade.

Breakdown of VIIs under shear is a concern in motorcycle applications, where the transmission may share lubricating oil with the motor. For this reason, synthetic oil or motorcycle-specific oil is sometimes recommended.^[10][11] The necessity of higher-priced motorcycle-specific oil has also been challenged by at least one consumer organization.

Hope this helps.

[Paul 84]

10 / 40w semi is what Iv always used in all mine

[Kevin Abbott]

I use the vauxhaul 10/40 semi syn in all my cars. 

It is even the spec for my 5 series BMW 2.5 24v turbo and it runs great in that. 

Its in the 4L jeep and it's going in the 900cc VW UP too 

oh yea. It's in the manta. 

[johnboy]

I'll stick with my 10/40 then, thanks guys.