Transmission Fluid, ???? Options

[mxhondarider832]

I have a '74 914 and the transmission is a little leaky and need to change the fluid, the book says to use straight 90w oil but I am having a really tough time finding it so I was wondering if there was a newer substitute that I could use. This is my first 914 and I am struggling a little bit and could use some help thanks

[ME733]

(IMG:style_emoticons/default/popcorn[1].gif) ...bottom line is THIS If you have really good sycronizers the expensive trick shit oils (silicone oils, or oils with ptf,s, etc,) will work better than std transmission oils..(for a while)..IF you have an older transmission with unknown sycronizers use good old VALVOLINE transmission oil found in qt bottles at your local auto parts store...80/w/90.....85/w/90. the gear oil as originally equiped was about a 90 wt oil...without any additives...... (IMG:style_emoticons/default/popcorn[1].gif)

[Dr Evil]

(IMG:style_emoticons/default/popcorn[1].gif) ...bottom line is THIS If you have really good sycronizers the expensive trick shit oils (silicone oils, or oils with ptf,s, etc,) will work better than std transmission oils..(for a while)..IF you have an older transmission with unknown sycronizers use good old VALVOLINE transmission oil found in qt bottles at your local auto parts store...80/w/90.....85/w/90. the gear oil as originally equiped was about a 90 wt oil...without any additives...... (IMG:style_emoticons/default/popcorn[1].gif)

Um, no.

Use 80w90 GL5 rated oil only. Redline oil is actually contraindicated in our gearboxes (hypoid gears).

Here is something to consider for those of you who are slaves to the colored oils:

The stock oil was 80w90 GL5 since 30 years ago. The stock oil lasted in abused and unabused gear boxes for 30 yrs.

The colored oils have detergent properties that can be good or bad, depending. Detergents keep the dirt and crap that gets into your gear box emulsified so that instead of settling to the bottom and forming a nice sludge that I find 30yrs later, it creates a nice abrasive lubricant that causes things to wear faster. You might do well to put a filter over the vent on the case, but I dont know for sure. All I know is that nothing settles out of the colored oils and that aint natural.

If you use the colored oils, change them often or suffer the abrasive consequences.

[detoxcowboy]

(IMG:style_emoticons/default/popcorn[1].gif) ...bottom line is THIS If you have really good sycronizers the expensive trick shit oils (silicone oils, or oils with ptf,s, etc,) will work better than std transmission oils..(for a while)..IF you have an older transmission with unknown sycronizers use good old VALVOLINE transmission oil found in qt bottles at your local auto parts store...80/w/90.....85/w/90. the gear oil as originally equiped was about a 90 wt oil...without any additives...... (IMG:style_emoticons/default/popcorn[1].gif)

Um, no.

Use 80w90 GL5 rated oil only. Redline oil is actually contraindicated in our gearboxes (hypoid gears).

Here is something to consider for those of you who are slaves to the colored oils:

The stock oil was 80w90 GL5 since 30 years ago. The stock oil lasted in abused and unabused gear boxes for 30 yrs.

The colored oils have detergent properties that can be good or bad, depending. Detergents keep the dirt and crap that gets into your gear box emulsified so that instead of settling to the bottom and forming a nice sludge that I find 30yrs later, it creates a nice abrasive lubricant that causes things to wear faster. You might do well to put a filter over the vent on the case, but I dont know for sure. All I know is that nothing settles out of the colored oils and that aint natural.

If you use the colored oils, change them often or suffer the abrasive consequences.

Listen to the DR. he is the 914 transmission Dr. 80/90 GL5