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ASL CamGuard is a comprehensive additive package formulated to supplement specific functions in a wide variety of motor oils. It was designed to dramatically improve the performance of all mineral based , semi-synthetic and fully synthetic motor oils in the areas of corrosion protection, wear reduction, and seal protection.

Camguard is an advanced oil supplement designed to give regular engine oil what it needs to protect and lubricate any engine. Camguard is a synergistic blend of advanced oil additives from all over the world, designed to reduce wear, curb deposit formation and more importantly protect engines against rust and corrosion. It contains multiple corrosion inhibitors for both ferrous and non-ferrous metals. A combination of ashless anti-wear compounds, anti-oxidants designed to reduce carbon deposits and special seal conditioners to prevent oil weeping. Camguard is FAA accepted and approved for use in piston engine aircraft oils meeting SAE-1899 standards. Camguard is compatible with piston aircraft oils, passenger car motor oils, most marine oils, and heavy-duty diesel oils.


  • FAA accepted
  • Fights rust & corrosion
  • Vastly reduces engine deposits
  • Provides extreme pressure and anti-wear protection
  • Conditions engine seals for extended life
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Bought an IO-390 equipped RV-7A several years ago which the previous owner didnt fly much. Iron was in the low 20s according to Blackstone and started using CamGuard after purchase. Iron dropped to 10-11 and is consistently in this range. Cant say enough about this product and its benefits for engines in high humidity environments and for those seeing irregular use.

Phillip H
June 16, 2019

Use this all the time. Never had an engine problem

Waypoint A
May 24, 2019

Great product, recommended by many and it really does work. This is not snake oil. :-)

April 27, 2019

I always use 1 bottle at every oil change. Independent studies have concluded that the additive aids in protection and reduces corrosion.

Jim J
March 11, 2019

I figured this stuff was snake oil at first, but tried some after a recommendation from someone I trusted. I cast a critical eye on my next oil analysis, and was very pleasantly surprised to find the wear metals to be greatly reduced. Cut in half, actually. So, I use it now!

December 13, 2018

Good stuff. Quick shipping

November 12, 2018

As always no problems. Thats why I purchase from Spruce.

John H
November 11, 2018

I started out several years ago using a/s 15w50 in my io360l2a lyc in my 172s and really had no problem with it. with 300hrs on engine since new, it used about 1qt every 15 to 20hrs. after a few years with about 800 hrs on engine, I decided to start adding cam guard as per instructions on bottle. ( 1.6oz per qt ) within 25 to 30 hrs , all the sudden I was using 1qt pr 7hrs. I called Ed Collins,(cam guard) and told him what happened. he told me he had heard of this before and suggested switching to phillips xc20w50. after a couple of oil changes using the xc and camguard, my oil consumption has gone down to about 1qt per 12hrs. with a little over 1000 hrs on engine. my oil stays fairly clean and compression as always around 78/80 . aeroshell says you dont need camguard with their oil so who knows??? jst fyi !!! Ill probably stay with camguard and phillips.

October 30, 2018

Alan S
October 21, 2018

Noticed immediate difference in my engine Would not run without it

James H
October 4, 2018


Q: How much CamGuard do I use per oil change? I use AeroShell mineral. Thanks.

Per the manufacturer, one pint of CamGuard will serve 8-10 quart sump for the change.

Q: Is there a shelf life for Camguard aviation oil additive?

Per the supplier: The shelf life is indefinite.

Q: Is CamGuard safe to use in 15W-50 oil? I understand 15w50 has additives blended in and I dont want to add camguard if doing so would have adverse affects. Thank you

Per the supplier: Yes. CamGuard is perfectly safe to use with 15W-50 oil.

Q: I have a 12 quart sump, what is the correct amount of Camgaurd to use at oil change?

The correct ratio is 1.6 oz of Camguard per quart. So for 12 quarts, you would need 19.2 oz.

Q: Just had the annual done on my 1976 C182P. Oil change with 10 qts added out of 12 available in sump. Have only done two high speed taxis since the annual. Can I add Camguard at this time?

It is recommended to add Camguard during each oil change. You would add 1.6 ounces of Camguard Aviation with each quart of makeup oil between oil changes.

Q: Does CamGuard retard break-in or cause it to cease if used during new engine break-in period?

Camguard is made NOT to be used during the break-in period of a new engine.

Q: Can CamGuard be used with Aeroshell 15W-50 oil which already has additives?

Yes, this can be used with 15W-50.

Q: Can and should Camguard be used with PHILLIPS 66 X/C AVIATION OIL 20W50?

Yes, this is one of the preferred oils that Camguard recommends mixing this with.

Q: I just changed my oil (8 qtrs). Do I just add it on top of the new oil? Is it ok to add it even if the new oil has a couple of hours?

Per Camguard: You would need to discuss this with the engine manufacturer or your A&P for this information.

Q: Is it safe to use Camguard with Aeroshell W100PLUS?

Yes it is safe but it will not do any better with the camguard as the W100plus already has an additive IN it.

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