Will thia work for my 99 s10 manual transmission?

I have used it in my 98 S10 with the nv1500 5 speed. Worked fine .

I will be replacing the Pensoil Syncromesh in my Jeep Wrangler with the NV3550. Will this be safe to use?

I don't have a Jeep, but the Royal Purple Synchromax fluid is specifically designed to replace all Synchromesh applications so as long as your Jeep's NV3550 calls for Synchromesh (which I think it does) then you should be fine. Synchromax would be a good upgrade.

Anybody try this in sonic with a 1.8 5 speed? Thanks

I'm sure the trans in a sonic is Korean made and I use it in my Honda civic si and it made my shifts smooth and precise

Will this work in a 2014 mustang manual?

There is a tool on the Royal Purple website: you enter your make and model (and year) and it shows you all the recommended products for your car (engine, transmission, transfer case, differentials, etc.)

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Description

⚙️ Shift smarter, drive stronger with Royal Purple Synchromax!

LONG LASTING PROTECTION - Synerlec additive extends oil life while keeping your transmission cleaner and quieter.
POWER BOOST WITH EVERY DROP - Reduced friction means more power delivered to the wheels—feel the difference on every drive.
EFFORTLESS SHIFTS EVERY TIME - Experience smoother gear changes with Synchromax’s friction-reducing formula.
ENGINEERED FOR EXTREME CONDITIONS - Maintains peak performance across a broad temperature spectrum, so your ride never misses a beat.
MADE IN THE USA TRUSTED WORLDWIDE - Premium synthetic formula crafted for professionals who demand reliability and excellence.

Royal Purple 01512 Synchromax is a high-performance synthetic manual transmission fluid designed to improve shift quality, reduce gear noise, and protect against wear and corrosion. Ideal for manual transmissions, transfer cases, and 2-cycle motorcycle gearboxes, it operates efficiently across a wide temperature range and extends oil life with advanced Synerlec technology. Proudly made in the USA, this 1-quart jug delivers professional-grade reliability for enhanced vehicle performance.

Specifications

Material	Synthetic
Brand	Royal Purple
Package Information	Jug
Liquid Volume	1 Quarts
Item Weight	1 Pounds
Recommended Uses For Product	Corrosion Inhibitor
Viscosity	1
Specific Uses For Product	Manual transmissions, transfer cases, 2-cycle motorcycle gear boxes, wide temperature range operation, friction material compatibility, corrosion and oxidation protection
Item Form	Liquid
Global Trade Identification Number	00641330015120
Manufacturer	Royal Purple
Net Quantity	946.35 Milliliters
UPC	641330015120
Number of Items	1
Model	1512
Product Dimensions	10.16 x 5.08 x 2.54 cm; 453.59 g
Item model number	ROY01512
Manufacturer Part Number	1512
OEM Part Number	01512
Volume	1 Quarts
Assembly Required	No
Country of Origin	USA
Item Weight	454 g

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