SKU: 50125444735

Boss Lubricants Xtreme 15W40 Synthetic Blend Diesel Engine Oil – CK-4, Heavy Duty, 20L Pail

$107.95 $119.95
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Sep 24 - Sep 29

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Boss Lubricants Xtreme 15W40 Synthetic Blend Diesel Engine Oil – CK-4, Heavy Duty, 20L PailKeep your engines running strong with Boss Lubricants Xtreme 15W40 Synthetic Blend Diesel Engine Oil. Designed for heavy duty diesel engines, this premium CK 4 oil offers excellent wear protection, high oxidation stability, and superior sludge control. Formulated with Group III base oils and an advanced additive system, Boss 15W40 ensures reliable performance in severe operating conditions while extending engine life. Perfect for fleets, construction

Keep your engines running strong with Boss Lubricants Xtreme 15W40 Synthetic Blend Diesel Engine Oil. Designed for heavy-duty diesel engines, this premium CK-4 oil offers excellent wear protection, high oxidation stability, and superior sludge control.

Formulated with Group III base oils and an advanced additive system, Boss 15W40 ensures reliable performance in severe operating conditions while extending engine life. Perfect for fleets, construction equipment, agriculture machinery, and highway trucks.

✅ Key Benefits:

  • Meets or exceeds API CK-4, CJ-4, CI-4, CH-4

  • Superior sludge and varnish protection

  • Thermal stability & high oxidation resistance

  • Excellent low temperature flow for cold starts

  • Protects against wear, deposits, and corrosion

  • Designed for modern emission control systems (EGR, DPF, SCR)

Specifications (15W40):

  • Density @ 15°C: 0.879 kg/L

  • Kinematic Viscosity @ 40°C: 118 cSt

  • Kinematic Viscosity @ 100°C: 15.7 cSt

  • Viscosity Index: 140

  • Flash Point: 232°C

  • Pour Point: -33°C

  • TBN: 10

  • Ash Sulphate: 0.99%

OEM Approvals / Meets Requirements:

  • Caterpillar: ECF-3 / ECF-1

  • Volvo: VDS-4.5/4/3/2

  • Mercedes-Benz: 228.31, 228.3

  • MAN: M-3575, 3275

  • Cummins: 20086, 20081, 20071, 20072, 20076, 20077, 20078

  • Detroit Diesel: 93K222/228/15/14

  • Ford: WSS-M2C171-F1

  • Renault: RLD-4, RLD-3

  • Allison: C-4/3

  • Global DHD-1

  • JASO DH-2

Package Size:

  • 20 Liter Pail

Safety Data Sheet

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 50125444735

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4.6 ★★★★★
Based on 19 reviews
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L
Verified Purchase
Lisa S.
Waukegan, US
★★★★★ 5
Love it
Color: A-mz721- Multicolor, Size: Medium
Beautiful design - looks as good, if not better - than advertised, and the fit was spot-on, too. Great top at a great price!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026
J
Verified Purchase
Jill T Osborne
Battle Creek, US
★★★★★ 4
Pretty and comfy
Color: A-mz721- Multicolor, Size: XX-Large
Great fit, great colors...only wish ir was a bit more cotton but i'll live with it the tops so nice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
S
Verified Purchase
Sara
Cuba, US
★★★★★ 5
The perfect throw-on athletic dress (with built-in shorts!)
Size: Small, Color: Navy Blue
I’ve been loving this athletic dress—it’s one of those pieces that’s both functional and cute, which is hard to find. The fabric is lightweight, breathable, and slightly stretchy, so it’s comfortable whether you’re running errands, going for a walk, or just chasing kids around all day. The built-in shorts are a huge plus. They stay in place well and make it feel more secure than a regular dress, especially on busy days. I also appreciate the pockets—they’re actually usable and don’t feel bulky. The fit is relaxed and flowy, which I personally like because it’s easy and flattering without clinging. The straps are adjustable, so you can customize the fit a bit depending on your height or preference. I’d say it runs true to size for a looser fit. If you want it more fitted, you could size down, but I like the casual, sporty look as is. Overall, this is a great everyday summer staple—super easy to style with sneakers or sandals, and perfect for travel or on-the-go days. I’ll definitely be getting more colors!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
A
Verified Purchase
Amber
Los Angeles, US
★★★★★ 5
Perfect for summer days.
Size: Medium, Color: Deep Gray, Size: Medium, Color: Deep Gray
I absolutely love this little athletic summer dress. I typically wear a size ten and ordered this in a medium and it's a perfect fit. I have the straps short so way it doesn't look baggy. It is super soft and comfortable. It is breathable and a perfect cut and length for me so so I plan on wearing it all during hot summer days. This is very versatile and easy to style by layering different things underneath it. I have a gray and leopard sports bra that is a really close shade of gray so it almost looks like it's one piece. I plan to order the teal as I have a swimsuit top that will match that color spot on. It seems like it is good quality and should hold up well to normal usage. I like that it has really big pockets , but I likely will not use them often lol. I just like the fact that if I need to have pockets they are there.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
T
Verified Purchase
The Lymans
Louisville, US
★★★★★ 4
Size down! But overall comfortable and cute and good quality
Size: Small, Color: Light Yellow
Overall it’s cute and comfortable, but my advice is to SIZE DOWN!!! I wish I would have, but I’ve already washed it so it’s too late. The straps are adjustable, but even so, I’ve had to tighten them as far as they’ll go. For reference, I am 5’1” and 125#, rectangle shaped/boxy body with a very small chest and I got a Small. The top gapes open on me and the dress is longer than I prefer for this style. Material/fabric is nice and good quality and it’s a perfect one-piece easy outfit for warm days. I like the yellow color too. It is tricky to find the right bra to wear with it, though. Got lots of compliments on it the first time I wore it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026

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