Hot Shot's Secret Green Diamond 15W-40 Semi-Synthetic CK-4 Engine Oil (1 Gal)
Fits: RAM • Chevrolet • GMC • Ford
Diesel Dollars is Southern Diesel Supply's Loyalty Program. Purchasing with Us Earns you 1 Point for every 1 Dollar spent to use for future buys!
By ordering the Hot Shot's Secret Green Diamond 15W-40 Semi-Synthetic CK-4 Engine Oil (1 Gal) you will earn 37 DIESEL DOLLARS in your SDS Fuel Tank!
Hot Shot's Secret Green Diamond 15W-40 is a semi-synthetic heavy-duty engine oil built on Hot Shot's CK-4 additive package, sold here in a 1-gallon jug. It isn't tied to one engine, so it suits any diesel pickup whose owner's manual calls for a 15W-40 grade. Owners buy it for added film strength and better cold-weather starts than conventional oil.
Fitment
Engine oil doesn't fit by year, make or model. It fits by grade and spec. Check your owner's manual for the viscosity and oil category your engine calls for, then match it to the label: this jug is 15W-40, semi-synthetic, with Hot Shot's CK-4 additive package. Some grades in the Hot Shot's line are built for racing or equipment rather than a daily-driven pickup, so read the spec before you buy. Not sure what your truck takes? Verify by VIN or call us and we'll check it for you.
Why this part
Green Diamond 15W-40 Semi Synthetic Heavy Duty pairs a semi-synthetic base with Hot Shot's CK-4 additive package. That package is there to improve performance and increase film strength, which is how well the oil film holds up between moving parts under load. Hot Shot's formulated the oil specifically to prevent deposits and oil breakdown. It also reduces friction and prevents rust, and the company says it extends injector, turbo and engine life.
The semi-synthetic blend matters on cold mornings. Hot Shot's says Green Diamond improves cold weather starts compared to conventional oils, so you get a step up from a straight conventional 15W-40 without moving to a full synthetic.
Hot Shot's feature list:
- Made in the USA
- Improves Performance
- Prevents Deposits & Oil Breakdown
What you get
- One 1-gallon jug of Hot Shot's Secret Green Diamond 15W-40 Semi Synthetic Heavy Duty engine oil
- Viscosity grade: 15W-40
- Base: semi-synthetic
- Additive package: Hot Shot's CK-4
- SKU: LSGDGALSEMI-SYN
About Hot Shot's Secret
Hot Shot's Secret has made diesel lubricants and additives since 1997 out of Mount Gilead, Ohio, where its products are made and shipped. The line runs from engine oil and transmission fluid to gear oil, fuel additives and coolant, all aimed at diesel pickups and the trucks that tow with them. If you want a full synthetic 15W-40 instead, Hot Shot's also makes Black Diamond Outlaw 15W-40 full synthetic CK-4.
Frequently asked questions
Is Green Diamond 15W-40 a full synthetic?
No. It's a semi-synthetic. Hot Shot's full synthetic 15W-40 is Black Diamond Outlaw CK-4. Green Diamond still improves cold weather starts compared to conventional oils.
Will it work in my truck?
It isn't engine-specific. Match the viscosity and oil category in your owner's manual. If your manual calls for 15W-40 and you want a second opinion on the spec, send us your VIN and we'll check it before you buy.
Where is it made?
Hot Shot's lists Green Diamond as made in the USA. The company makes and ships its products from Mount Gilead, Ohio.
Questions on fitment? Call the shop at the number in the header. We install everything we sell.
Diesel Dollars is Southern Diesel Supply's Loyalty Program. Purchasing with Us Earns you 1 Point for every 1 Dollar spent to use for future buys!
By ordering the Hot Shot's Secret Green Diamond 15W-40 Semi-Synthetic CK-4 Engine Oil (1 Gal) you will earn 37 DIESEL DOLLARS in your SDS Fuel Tank!