Can I use this in cold weather if I use another source of anti-gel? I get kwik trip diesel and there premium line comes with anti-gel

I use this product Alone. I have 04 3500 ,lb7 Duramax 300k never worked on injector replacement, no smoke, averaging 23mpg also use red label in my 2016 3500 getting 16 mpg towing

is opti-lube ok for marine diesel engines ?

Yes, it can be used in all Diesel engines including Marine applications.

How often do I have to add to diesel?

I add 2-4oz. with every fill up. I add 4oz+ when I fill my 50 gal auxiliary tank. The product comes with recommended treatment per 10, 20 etc gal of diesel fuel.

How long does this store for? I have a tiny 2 liter diesel with a 14.5 gallon tank. I expect this to last me more than a year.

You can expect the fluid to last 4-5 years depending on storage conditions. The bottle itself may not last that long so you may have to transfer into something else after 2-3 years.

Manufacturer	Opti-Lube
Brand	Opti-Lube
Product Dimensions	21.59 x 11.43 x 26.67 cm; 113.4 g
Item model number	OPT-XL1
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	21.6 x 11.4 x 26.7 cm
Item Weight	113 g

Opti-Lube XL Xtreme 潤滑剤 ディーゼル燃料添加剤: 1ガロン アクセサリー付き (HDPEプラスチックハンドポンプと空の4オンスボトル2本) 最大1,280ガロン対応

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Opti-Lube XL Xtreme 潤滑剤ディーゼル燃料添加剤: 1ガロンアクセサリー付き (HDPEプラスチックハンドポンプと空の4オンスボトル2本) 最大1,280ガロン対応