Question 1

Can you mix gl-4 gear oil with gl-5 gear oil? what is difference? if do 50/50....will be good together? why or why not?

Accepted Answer

NO NO NO...  GL-4 is specific for older transmissions that have bronze/brass parts. GL-5 will DESTROY these parts.. believe me I know from experience. My local speed shop mistakenly gave me GL-5 for my 91 YJ with the X-5 trans.  Within ten miles I could smell the problem happening. They honored the mistake and gave me a gallon of correct GL-4 so at 150K my X5 was shifting much better. It's in the shop now at 185K for a trans rebuild (yeah it lasted THAT long) and Troy Transmissions was pleased to hear I wanted Redline. He insists on synthetics for Arizona heat and drivers who get in extreme conditions, look up the "back way to Crown King" for an idea of our kind of fun.  And a heads up for the Y owners... beware the fast lube places.  I went to two different shops and BOTH insisted GL-5 was the correct lube!!!  NOT! Luckily the $450 they wanted just to change fluids scared me off and I did what Jeepers should do... work on your own rig yourself.

Question 2

why do many say to not change the old gear oil & that the "gunk" in old gear oil makes transmssion last longer & might have problems with new gear oil

Accepted Answer

What they are referring to is automatic transmission fluid. Automatic transmissions have a series of "bands" with clutch like materials bonded to the friction side. On a worn out automatic transmission, the friction materials on these bands are already smoothed out and slip. Since automatic transmission are driven by hydraulic pressure, the "gunk" suspended inside old fluid will help with "gripping" action with these band. This redline gear oil is used in Manual transmissions. The old saying would not apply here.

Question 3

Is MT 90 good for a 1995 jeep yj manual transmission?

Accepted Answer

Yes, great product; bought the vehicle used and it was not sure what  type of fluid it had in the transmission. The jeep sounded like a bus and once I added the MT-90; big difference and most importantly much quietly.

Question 4

Is this product compatible with my 1975 vw beetle, type 1 which spec's 85w/90 gl-4 gear oil? or do you have a synthetic product that is?

Accepted Answer

I would look on the Volkswagen site or call a Volkswagen service department you can fool around with weights on engine oil but I wouldn't put the wrong weight in on a transmission

ASIN	B002INX20C
Amazon 売れ筋ランキング	車＆バイク - 694,115位 ( 車＆バイクの売れ筋ランキングを見る ) ATF・ミッションオイル・ギアオイル - 623位
GTIN (Global Trade Identification Number)	00083522503051
SAE J300粘度グレード	75W 90
UPC	083522503051
おすすめ度	4.8 5つ星のうち4.8 (1,585) var
パック数	1
パッケージ内に含まれる商品の数	1
ブランド名	Red Line
メーカー名	Red Line
メーカー型番	50305
ユニット数	3785.41 ミリリットル
品番・型番	50305
商品の推奨用途	潤滑油。
商品の用途	マニュアルトランスミッションとトランスアクスル。
商品の重量	2.27 キログラム
容器の種類	カン
液体の容量	128 液量オンス
素材	合成素材
適合可能な材質	真鍮

Red Line MT-90 ギアオイル 75W90 GL-4 1 Gallon (128 Ounces) 50305

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