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   The sample cap shown and ALL CAP MODELS come with 2 keys and a coded number.

Do you really want to settle for A cheap plastic CAP?

  GUARDIAN is the ORIGINATOR AND PATENT HOLDER of secure METAL locking caps, AIRCRAFT QUALITY ALUMINUM,
solely for Harley-Davidsons - accept no substitutes!

Wait! I have an oil filter. WHY GET THIS? WHY?

GUARDIAN Oil Protector™ locking oil caps can prevent these and other items from entering your engine through the oil cap:

• Sand

• Cigarette butts

• Wood screws

• Gravel, rocks

• Small nails

• Wood chips

• Corrosive liquids

• Honey

• Karo Syrup

• Paper items

• Cotton, rags

• Other liquids

• Other items

     These items - and others that are simply hard to believe - have been found in engines upon tear-down as engine rebuilding was necessary. It takes only seconds to insert these in an unprotected bike, and they'll take the bike down causing awful damage.

U.S. manufactured to exacting specifications:

     A new customer says it best!

       "Hi Kurt. Before I got your cap a vandal poured Karo Syrup in my oil pan. That stuff mixes well with oil when it heats up - flows like a charm. Then when you park your bike and it cools down overnight, it molecularly bonds with the motor oil and coagulates throughout the motor and clogs oil passages. It’s not a matter of having insurance, it’s being a thousand miles out and dealing with a dead engine on your vacation.
     Yes, insurance paid for the repair, but that’s not the point. The point is… there are haters out there that can do great damage too easy. With the locking oil cap, I removed “easy” and sleep well when my bike isn’t parked in my garage overnight. Thanks Guardian.”          - - Ed Perry

High Quality, Precision Machined METAL

Locking Oil Caps for Harley-Davidson Motorcycles

• Aircraft Quality Aluminum

• Completely WATERPROOF

• CNC Precision Machined & Chromed

• 2 numbered keys included

• EASY Installation:  On 2 models you use your existing oil stick - see the YouTube Easy Assembly video or website video- other models, just put it on your bike right out of the box.

• Low cost and cost effective

(photo above) Locking oil cap protector with key and dipstick (dipstick not included on 2 models; use your existing dipstick), high quality, necessary accessories for Harley-Davidson motorcycles  [Back to Page Top]

SEE DETAIL PHOTOS on the detail -order page. See other photos at FAQs

- Click photo for larger size detail

• Protect your bike engine and your investment and riding time.

• Eliminate the risk of someone sabotaging your oil

• Eliminate the cost to rebuild an engine damaged by foreign objects entering through an unprotected oil cap. Stock engine or after-market parts? $6,000. and up is the figure we have, but it depends upon how much damage.

(photo) GUARDIAN key-locked oil protector cap installed
 on a Harley-Davidson

SEE DETAIL PHOTOS on the detail -order page. See other photos at FAQs

[Back to Page Top]

STOP!

"Why do I need this? I have an oil filter."

    Your oil filter will not protect your engine from damage due to vandalism or sabotage. Your oil filter is the very last thing that touches your oil, filtering the oil AFTER it flows through the engine. Oil, and anything that enters through the oil cap, goes into the sump and then to the oil pump, pumping oil through the engine. AFTER traveling through the engine is the oil filter - last. Anything added to the oil goes directly to the pump and then to the engine. The oil filter is not the issue. You need to protect your engine from foreign objects. The GUARDIAN Oil Protector™ Locking Oil Cap does that.  

Locking oil cap cost:  6  cents/day (5 year example)

Engine rebuilding:  $ 6,000. plus

[Back to Page Top]

OIL FLOW CHART:  Harley-Davidson Motorcycles
Your oil filter will not protect you.

GUARDIAN Oil Protector™ locking oil caps can prevent these and other items from entering your engine through the oil cap:

• Sand

• Cigarette butts

• Wood screws

• Gravel, rocks

• Small nails

• Wood chips

• Corrosive liquids

• Honey

• Karo Syrup

• Paper items

• Cotton, rags

• Other items

SEE DETAIL PHOTOS on the detail -order page.
See other photos at FAQs