Would this be good for a yong heng 4500 psi compressor ?

It's mineral oil based but it's got some petroleum additives which are bad/toxic to breath if you doing scuba filling. I would use it for gun air stuff-I use mineral based oil for all my air gun, tool, compressor stuff. I would use this for gun compressors but my gun compressor is that oil free box compressor.

Is it full syenthetic?

I love this stuff!!! It's ice for my compressors. I do a few fills and drains to get a nice clean crankcase fill up. It looks, feels, behaves, smells like natural mineral oil with synthetic stuff. Mobil says it mineral oil based.

It's 30 and it says it somewhere-it also pours like 30+.

Mobil Rarus 427 Compressor Oil | Desertcart Slovakia

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€ 30.98

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Keep your compressor running smoother, longer — don’t get left behind!

MADE IN THE USA - Crafted with quality and reliability you can count on
TRUSTED BY PROFESSIONALS - Highly rated with 4.8 stars from 294 reviews—join the satisfied maintenance pros
PERFECT VOLUME PERFECT FIT - 32 fl oz bottle designed for precise one-quart compressor oil changes
SUPERIOR WEAR TEAR DEFENSE - Mineral oil base minimizes equipment deposits and extends compressor life
ENGINEERED FOR EXTREME CONDITIONS - Delivers premium protection from mild to severe compressor use

MOBIL RARUS 427 Compressor Oil is a premium synthetic lubricant designed for air compressors operating under mild to severe conditions. With a high flash point of 480°F and viscosity rating of 100, it ensures exceptional wear protection and reduces downstream deposits. Packaged in a convenient 32 fl oz bottle and proudly made in the USA, it’s a top choice for professional-grade compressor maintenance.

Specifications

ASIN	B00A6YB1YE
Best Sellers Rank	#22,169 in Automotive ( See Top 100 in Automotive ) #139 in Keychains
Brand	Mobil
Brand Name	Mobil
Container Type	Bottle
Customer Reviews	4.8 out of 5 stars 296 Reviews
Flash Point	480 Degrees Fahrenheit
Global Trade Identification Number	00071924448933
Included Components	Unit^Instruction Guide
Item Form	Oil
Item Type Name	Automotive Accessories
Item Weight	1.85 Pounds
Liquid Volume	32 Fluid Ounces
Manufacturer	MOBIL
Material	Synthetic
Model Number	100870
Number of Items	1
Package Information	Bottle
Part Number	100870
Recommended Uses For Product	Auto
UPC	094703158991 071924448933
Unit Count	32.0 Fluid Ounces
Viscosity	100
Warranty Description	1 year manufacturer

Reviews

L**U

23.12.2025

D**N

12.03.2026

J**P

14.12.2025

M**Y

11.01.2026

C**D

13.04.2026

M**E

21.11.2025

I**H

30.10.2025

W**E

10.12.2025

J**H

26.08.2021

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