As the spring melt starts the most critical time to grease your suspension is after the melt. The boot should be filled until water and or grease come out. If the tech tells you it can’t be greased find a new shop or at least get a second opinion. There are several tools on the market that allow greaseless components to be serviced. There are also sealed components that should not be serviced any good shop can tell the difference. Remember there is a difference between non serviceable and sealed. Also be sure the rear components are checked and greased as many front wheel drives have serviceable suspension parts in the rear. Remember to keep an eye on tire pressure as the temperature raises so will the tire pressure. Of course if you live in the warmer parts of the country you can ignore most of this.