Always use luca 80w-90 in ford ranger 2.3l, 7.5" rear diff. wanted to try this. any issues with it being a 75w vs 80w? is this better than lucas?

I use the royal purple 75w-90 in my RAM 2500 differential. My differential is made by American Axle Manufacturing and I talked with one of their mechanical engineers who said the viscosity requirement is determined by several criteria with ambient and operating temperature being big determinants. I live in a warm climate so he said I could use a heavier weight oil. With that knowledge I don't believe there is a big enough difference between the 75 and 80 other the better lubricity at lower ambient and operating temperature. He did recommend amsoil but said the royal purple is just as good.

I have graphite/ composite synchronizers in my transmission , will they be damaged by the use of anything other than the "Castrol syntorque" recom

I've had the best experience with Redline MT90 in manual transmissions. RP was not working well with syncros (grinding gears when shifting).

I know that the product description says that it is not for use in wet clutch systems, but will it be okay for use in motorcycle final gear (shaft)

Will be fine as a motorcycle final gear oil. I use this product in two BMW motorcycles, a BMW R1150RT and a R1200S, as a final drive oil and also as the transmission oil.

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Royal Purple 01300 Max Gear 75W-90 High Performance Synthetic Automotive Gear Oil , 1 Quart (32 Ounces)

Product ID: 2251740

Details

Brand
Royal Purple
Item Weight
16 ounces
Liquid Volume
1 quarts
Material
Synthetic
Package Information
Bottle

🔥Synerlec additive tech

🚛Heavy-load gear protection

⚙️75W-90 synthetic viscosity

¥11685

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Drive smoother, cooler, and smarter with Royal Purple Max-Gear!

FUEL ECONOMY BOOSTER - Real-world users report up to 24% MPG improvement—drive farther, spend less.
MAINTENANCE MADE EASY - No extra additives needed; just pour and protect your drivetrain effortlessly.
VERSATILE APPLICATION - Perfect for trucks, RVs, marine engines, and manual transmissions requiring API GL-5/GL-4.
PROPRIETARY SYNERLEC ADDITIVE - Experience unmatched friction reduction and cooler, quieter operation.
ULTRA TOUGH SYNTHETIC FORMULA - Maximize gear power & longevity with premium 75W-90 synthetic oil.

Royal Purple 01300 Max Gear 75W-90 is a high-performance synthetic gear oil engineered with proprietary Synerlec additive technology to deliver superior protection, reduce friction, and extend gear life in heavy-duty automotive, truck, and marine applications. Trusted by enthusiasts for quieter operation and proven fuel economy gains, this 1-quart bottle is your go-to for maximizing drivetrain efficiency and durability.

Specifications

ASIN	B0007QGT34
Best Sellers Rank	#18,956 in Automotive ( See Top 100 in Automotive ) #36 in Gear Oils
Brand Name	Royal Purple
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (1,558)
Global Trade Identification Number	00641330013003
Included Components	Auto part, Automotive Accessories, Replacement and Performance parts
Item Form	Oil
Item Type Name	Gear Oil
Item Weight	16 ounces
Liquid Volume	1 quarts
Manufacturer	Royal Purple
Material	Synthetic
Model Number	ROY01300
Number of Items	1
Number of Packs	1
Part Number	01300
Recommended Uses For Product	Vehicle,Truck
Specific Uses For Product	Improve power and protection for heavily loaded gears in trucks, automobiles, and marine engines
UPC	641330013003
Unit Count	32 Fluid Ounces
Viscosity	75W-90
Warranty Description	Manufacturer Warranty

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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¥11685

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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