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Bel-ray Thumper Synthetic 4-Stroke Engine Oil
Bel-ray Thumper Synthetic 4-Stroke Engine Oil

$11.99 - $39.99
14% Off - Save up to $2.00
Rating: 5 out of 5 stars



See Also:
Item #BRY000S

9 Reviews

5 out of 5 stars
  •   9 reviews
  •   0 reviews
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All Reviews


Verified Purchaser Top 500
Over 5 months ago
5 out of 5 stars
Great product

I’ve been running this in my bike for a couple years and it works great


Verified Purchaser Top 500
1 year 4 months ago daytona beach florida
5 out of 5 stars
Great oil good price

I've used bel-ray in my two stokes and in my four strokes and cant say ive ever seen or smelled anything bad about them. The 10-40 holds up well in the florida heat.


Verified Purchaser Top 500
2 years 1 month ago New Mexico
5 out of 5 stars
Bel-ray products

I have used Bel-ray products since the 80’s and haven’t been let down. The Thumper Racing Synthetic oil works great and is affordable.


Verified Purchaser Top 250 Contributor
Over 3 years ago Oregon, USA
5 out of 5 stars
Good oil

Can't tell a difference between this and the almost twice as expensive amsoil I've always used. This will be my oil from now on


Verified Purchaser
Over 3 years ago Elkins, WV 26241, USA
5 out of 5 stars
Thumper Oil

I just started using this in my RM-Z250.


Top 250 Contributor
Over 3 years ago Austin
5 out of 5 stars
Great Oil

I use this is my 15 CRF250R, and is working great. No issues with bike, the jug has a built in spout in the lid which makes pouring into a funnel that much easier.


Verified Purchaser Top 1000 Contributor
Over 3 years ago Clinton, Ms
5 out of 5 stars
Great deal

Great oil for a good price!


Verified Purchaser Top 500
Over 4 years ago New Wilmington, PA
5 out of 5 stars
Bel Ray oil.

Great oil at a good price. Works great in my kx250f. I also use Bel Ray gear saver oil in my 2 stroke


Verified Purchaser Top 50
Over 4 years ago Jacksonville FL
5 out of 5 stars
All I use in my Honda CRF450R

One of the Best Oils you can use, also when I switched to a 4 stroke bike back in 05 I contacted BelRay and spoke with John. We went over the oils for my new bike as I was a 4 stroke virgin and since I have used BelRay ever since I was a kid I stick with it. They are spot on offer great sound advice and support. When we tore my engine down the first time ever the guys in the shop thought it had been torn down and all new internals. That was at the 9 year age of my bike.

2 Questions

  • Answered:   2
  • Not Yet:   0

Question asked by Reed

Question: Can you recommend weight for 05&06  Polaris predator 500 The PS-4 is too expensive and in the southern Nevada deserts ambient temps exceed temps from May thru Sept 
Question asked 4 months 3 days ago
Question answered by robert
User's contributor status: Top 10
Question answered 4 months 3 days ago
Answer: You will want to refer to the owners manual for oil weight and specifications per vehicle.

Question asked by Haden57

Question: Would this work well for both my engine and transmission?
Question asked Over 4 years ago
Question answered by MotoSportExpert
User's contributor status: MotoSport Staff Expert
Question answered Over 4 years ago
Answer: For your 2008 Honda CRF150R this 4T 10W-40 will work great in the motor but for the transmission the Bel-Ray Gear Saver 80wt would be recommended. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.

# Part Numbers

Product Variant Manufacturer Part #
1 Liter / 10W40 99520-B1LW
1 Liter / 15W50 99530-B1LW
4 Liter / 10W40 99520-B4LW